ADO.NET Data Services v1.5 CTP1
http://blogs.msdn.com/astoriateam/archive/2009/03/16/ado-net-data-services-v1-5-ctp1-now-available-for-download.aspx
download: http://www.microsoft.com/downloads/details.aspx?FamilyID=3e3d4eaf-227b-4ad3-ad0d-3613db8aa9df

March CTP of the Windows Azure Tools and SDK
http://blogs.msdn.com/jnak/archive/2009/03/18/now-available-march-ctp-of-the-windows-azure-tools-and-sdk.aspx
download: http://download.microsoft.com/download/8/4/2/84291A86-26A4-44AB-8024-5A6700324061/VSCloudService.exe

Hotfix for Windows Azure Tools and SDK
Hotfix: Native Debugging Improvements
http://go.microsoft.com/fwlink/?LinkId=145526

Hotfix: Support for FastCGI on the Development Fabric
http://support.microsoft.com/kb/967131

Silverlight 3 Beta Released!
http://blogs.msdn.com/silverlight_sdk/archive/2009/03/18/silverlight-3-beta-released.aspx
http://silverlight.net/getstarted/silverlight3/default.aspx
download:
VS Tools : http://go.microsoft.com/fwlink/?LinkID=143571
runtime: http://go.microsoft.com/fwlink/?LinkID=143433
SDK : http://go.microsoft.com/fwlink/?LinkID=143435

Microsoft Expression Blend 3 Preview
http://www.microsoft.com/expression/blendpreview
download: http://go.microsoft.com/fwlink/?LinkId=146762

ASP.NET MVC 1.0 RTM
http://www.asp.net
download:
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=53289097-73ce-43bf-b6a6-35e00103cb4b

Hotfix for VS Crash with ASP.Net MVC in a Windows Azure Cloud Service Project
http://blogs.msdn.com/jnak/archive/2009/02/26/fix-available-asp-net-mvc-rc-crash-in-a-windows-azure-cloud-service-project.aspx
download: https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=16827&wa=wsignin1.0

.NET RIA Services
download : http://go.microsoft.com/fwlink/?LinkId=144609