We recommend the following resources as a good way to get started understanding the new features:
Visual Studio 2010 RTM is available through many routes - see here for details.
Right now! See this post for details http://blogs.msdn.com/wpfsldesigner/archive/2010/04/15/silverlight-4-releases-silverlight-4-tools-for-visual-studio-2010-rtm-available-now.aspx
You should update to the RTM Release of Visual Studio 2010 - see question 2 above
I'd like to use the new multi-monitor support to open my XAML and Design panes in separate windows, can I achieve that?
We’d like to add real support for tearing off the two parts of the split view in a future release – meanwhile there are a couple of workarounds:
If your goal is multi-monitor with code on the right and design surface on the left (for instance), then you can maximize VS2010 across both screens, set the splitter to be VERTICAL (there are buttons in the splitter bar that let you do this), then place the splitter at the join between the two screens (quickest approach)
If you want more flexibility, you can: