Here's a consolidated list of all the key downloads you'll need to update your developer workstation to the latest and greatest technologies announced this morning:

• Internet Explorer 8 Beta 1
  • Windows Vista / Windows Server 2008 (x86)
  • Windows Vista / Windows Server 2008 (x64)
  • Windows XP (x86)
  • Windows Server 2003 SP2 (x86)
  • Windows Server 2003 SP2 / Windows XP (x64)
• Silverlight 2 Beta 1 Runtime
• Silverlight 2 Tools for Visual Studio 2008 and SDK
• Expression Studio 2 Beta (contains Blend, Design, Encoder, Media and Web)
• Expression Blend 2.5 March 2008 Preview
• ASP.NET MVC Preview 2

A couple of tips:

• The Silverlight 2 Tools release (third item above) includes Silverlight 2. You don't need to install the runtime separately first: just run the tools installer and you'll have everything you need.
• The Visual Studio extensions don't work with the Express editions - make sure you've got the full Visual Studio 2008 installed before attempting to install them.
• If you installed Silverlight 1.1 Alpha, uninstall it first, along with any related tools or SDKs before installing Silverlight 2 Beta 1. I watched someone get into a bit of a mess this morning by trying to update Silverlight 1.1 Alpha in-place. Fortunately, they were still able to uninstall and reinstall, but you're definitely best to start with a clean machine.

Have fun!

Read the complete post at http://blogs.msdn.com/tims/archive/2008/03/05/download-links-for-mix08-announcements.aspx