Here are some new RIA related downloads compiled by my colleague David Lymburner I thought I would share:
Cheers,
Hans

Delivering the next generation web with Silverlight

Brief Description

Delivering the next generation web with Silverlight

Overview

Rich Internet Applications (RIAs) are gaining popularity with the growth and use of web 2.0. Watch how Windows Server 2008 can help your customers create the next generation of interactive web experiences.

http://www.microsoft.com/downloads/details.aspx?FamilyID=5ddb2eb9-0d99-4448-baf3-44aa49c37c77&DisplayLang=en

Hands on Labs for Developing Applications on Windows SharePoint Services 3.0

Brief Description

A set of 10 Hands on Labs for Developing Applications for Windows SharePoint Services 3.0 with Visual Studio 2005

Overview

A set of 10 Hands on Labs for Developing Applications for Windows SharePoint Services 3.0 with Visual Studio 2005. These labs are provided in C# and VB.NET languages. Each Hands on Lab is expected to take 60 minutes to complete and no SharePoint development experience is required. Participants are expected to have .NET development experience. The download includes lab manuals, completed lab exercises and any resource files required by the labs. The HOLs included are:

1. Web Parts
2. Data Lists
3. Event Handlers
4. Workflow
5. Silverlight
6. Page Navigation
7. Page Branding
8. Web Services
9. Content Types

http://www.microsoft.com/downloads/details.aspx?FamilyID=b885dce8-c93f-48aa-b798-4422febcc200&DisplayLang=en

ADO.NET Data Services Silverlight 2 B2 Client Refresh

Brief Description

Refresh to enable the Data Services client in Silverlight 2 Beta 2 to interoperate with Data Services in .NET 3.5 SP1 RTM

Overview

This refresh consists of an updated version of System.Data.Services.Client.dll for Silverlight 2 Beta 2 that enables the Data Services client in Silverlight 2 Beta 2 to interoperate with Data Services in .NET 3.5 SP1 RTM.

Note that this refresh is only a temporary release to allow continued interoperability between the Silverlight 2 Beta 2 data services client and server. It's an unsupported release and still a Beta release. Once Silverlight 2 RTM is released, all developers should stop using this release and use the Data Services library included in the Silverlight 2 SDK RTM release.

http://www.microsoft.com/downloads/details.aspx?FamilyID=cf8f88c3-d869-46de-a7bf-fb7712c791b7&DisplayLang=en