With the substantial number of new features and API added to the Silverlight 1.0 Beta release since the February CTP release, I decided to compile a list of the new API. I've grouped them into feature areas.

• New Inking Support
• Enhanced Error Handling Support
• New Animation, Graphics, and Media Features
• Redesigned Silverlight Control Model
• New Text and Font Support
• Other New Support

See Silverlight 1.0 Beta Enhancements and Converting a WPF/E Application to a Silverlight Scripting Application for other info on changes to the Silverlight programming model.

New Inking Support

API	Description
InkPresenter	Element that displays ink and can be a child, sibling or parent of other elements.
InkPresenter.Strokes	The collection of ink strokes that correspond to the InkPresenter.
Stroke	Represents a collection of points that correspond to a stylus-down, move, and stylus-up sequence.
Stroke.DrawingAttributes	Specifies the appearance of the Stroke.
Stroke.GetBounds()	Returns a Rect which is the bounding box of the Stroke.
Stroke.HitTest()	Returns true if the StylusPointCollection passed intersects the Stroke object; otherwise, false.
Stroke.StylusPoints	The collection of StylusPoint objects that make up the Stroke.
StrokeCollection	Represents zero or more Stroke objects that are grouped together.
StrokeCollection.GetBounds()	Returns a Rect which is the bounding box of the strokes in the collection.
StrokeCollection.HitTest()	Returns a collection of strokes that are intersected by the points in the StylusPointCollection passed.
StylusInfo	Represents information about the state of the stylus.
StylusInfo.IsInverted	Specifies whether the stylus is inverted.
StylusInfo.DeviceType	Indicates if the stylus represents mouse, stylus, or touch input.
StylusPoint	Represents a single point collected while the user is inking with the stylus or mouse.
StylusPoint.PressureFactor	The pressure of the stylus on the screen.
StylusPoint.X	The X coordinate of the StylusPoint in pixels.
StylusPoint.Y	The Y coordinate of the StylusPoint in pixels.
StylusPointCollection	Represents a set of related StylusPoint objects.
StylusPointCollection.AddStylusPoints	Adds a collection of StylusPoint objects to the collection.
DrawingAttributes	Represents the appearance of a Stroke.
DrawingAttributes.Color	The color of the associated stroke.
DrawingAttributes.Height	The height of the associated stroke.
DrawingAttributes.OutlineColor	The outline color of the associated stroke.
DrawingAttributes.Width	The width of the associated stroke.
DeviceType	Specifies the basic classes of pointing devices supported.
MouseEventArgs.GetStylusInfo()	Returns a StylusInfo object which gives information about the state of the Stylus.
MouseEventArgs.GetStylusPoints()	Returns a clone of the stylus points collected since the last mouse event.

For more information about inking in Silverlight, see the following topic: Ink Support In Microsoft Silverlight .

Enhanced Error Handling Support

API	Description
ErrorEventArgs	Provides data for the OnError event.
ErrorEventArgs.ErrorCode	Gets the error code associated with the error.
ErrorEventArgs.ErrorMessage	Gets the error description associated with the error.
ErrorEventArgs.ErrorType	Gets the ErrorType of the error associated with the event.
ErrorType	Describes the possible types of errors.
ParserErrorEventArgs	Provides data for XAML parser error events.
ParserErrorEventArgs.CharPosition	The character position within the line that the parser error occurred on.
ParserErrorEventArgs.LineNumber	Gets the line number at which the parser error occurred.
ParserErrorEventArgs.XamlFile	Gets the name of the Xaml file that the parser error occurred in.
ParserErrorEventArgs.XmlAttribute	Gets the xml attribute that the parser error occurred in.
ParserErrorEventArgs.XmlElement	Gets the xml element that the parser error occurred in.
RuntimeErrorEventArgs	Provides data for runtime error events.
RuntimeErrorEventArgs.CharPosition	The character position within the line that the runtime error occurred on.
RuntimeErrorEventArgs.LineNumber	Gets the line number at which the runtime error occurred.
RuntimeErrorEventArgs.MethodName	Gets the name of the method associated with the runtime error.

For more information about error handling in Silverlight scripting applications, see the following topic: Silverlight Application Scripting Error Handling.

New Animation, Graphic, and Media Features

API	Description
MediaAttribute	Represents an attribute from an entry in a ASX file.
MediaAttribute.Name	Gets the name of the MediaAttribute which is the name of the xml element in the ASX file that the MediaAttribute corresponds to.
MediaAttribute.Value	Gets the value of the MediaAttribute which is the value of the xml element in the ASX file that the MediaAttribute corresponds to.
MediaAttributeCollection	Represents a collection of MediaAttribute objects.
MediaAttributeCollection.GetItemByName()	Gets the MediaAttribute for the collection with the Name equal to the specified string.
MediaElement.Attributes	Gets the collection of MediaAttribute objects which corresponds to the current entry in the ASX file that Source is set to.
MediaElement.MarkerReached	Occurs when a timeline marker is encountered during media playback.
MediaElement.Markers	Gets the collection of timeline markers associated with the currently loaded media file.
TimelineMarker	Represents metadata associated with a specific point in a media file.
TimelineMarker.Collection	Represents metadata associated with a specific point in a media file.
TimelineMarker.Text	Gets or sets the text value of this TimelineMarker.
TimelineMarker.Time	Gets or sets the time at which this TimelineMarker is reached.
TimelineMarker.Type	Gets or sets the type of this TimelineMarker.
TimeLineMarkerCollection	Represents a collection of TimelineMarker objects.
TimeLineMarkerEventArgs	Contains arguments for the MediaElement.MarkerReached event.
TimelineMarkerEventArgs.Marker	Gets the TimelineMarker that triggered this event.
VideoBrush	Paints an area with video.
VideoBrush.SourceName	Gets or sets the Name of the MediaElement that provides video for this VideoBrush.
VideoBrush.Stretch	Gets or sets a value that specifies how the video of this brush stretches to fill the painted area.
UIElement.Resources	Gets or sets a collection of Storyboard objects that you can use to control animations.
ResourceCollection	Represents a collection of Resource objects.

For more information about using animations, graphics, and media in Silverlight scripting applications, see the following topics: Animation Overview, Media Overview, Silverlight Brushes Overview, and Silverlight VideoBrush Overview .

Redesigned Silverlight Control Model (previously the WPFE Control)

API	Description
Background	API name changed from BackgroundColor.
EnableFramerateCounter	Gets or sets a value that determines whether to display the current framerate in the hosting browser's status bar. (Microsoft Internet Explorer only)
EnableHtmlAccess	Determines whether the hosted content in the Silverlight control has access to the browser Document Object Model (DOM).
InitParams	Specifies the optional set of user-defined initialization parameters.
OnError	API redesigned to use enhanced error handling support.
OnFullScreenChange	API name changed from FullScreenChanged.
OnLoad	API redesigned to reflect changes to Silverlight control model.
OnResize	API name changed from OnResized.
Windowless	API name changed from WindowlessMode.

For more information about new and breaking changes on the Silverlight control, see the following topics: Silverlight Object Models, Using a Silverlight Control, Using CreateSilverlight.js and Silverlight.js, and Resizing a Silverlight Control.

New Text and Font Support

API	Description
SetFontSource()	Adds font files in the downloaded content to the object's collection of type faces.
FontSize	Gets or sets the font size for the content in this element.
FontStretch	Gets or sets the font stretch for the content in this element.
TextDecorations	Gets or sets the text decoration for the content in this element.

For more information on using text in Silverlight scripting applications, see the following topic: Text and Fonts Overview.

Other New Support

API	Description
MouseEventArgs.GetPosition()	Gets the x- and y-coordinates of the mouse pointer position. Note: the x and y properties on the MouseEventArgs have been removed and replaced this method call.
Downloader.GetResponseText()	Gets a string representation of the downloaded data.
UIElement.Canvas.ZIndex	Gets or sets a value that represents the z-order rendering behavior of objects in a collection.
UIElement.IsHitTestVisible	Gets or sets whether the contained area of this UIElement can be used for hit-testing.
UIElement.Visibility	Gets or sets the user interface (UI) visibility of this element.

--Brian
  Silverlight SDK Team