How to download and install Microsoft Visual Studio 2010 Beta 1: http://channel9.msdn.com/shows/10-4/10-4-Episode-20-Downloading-and-Installing-Visual-Studio-2010-Beta-1/
In this video, you'll learn how to install Microsoft Visual Studio 2010 Team Foundation Server 2010 Beta 1, Microsoft Visual Studio 2010 Team Suite Beta 1, and Microsoft .NET Framework 4.0 Beta 1. You can perform all of the steps in this video by using trial software.
The usual disclaimers apply: Use these resources at your own risk, and use them on computers that you won't mind reformatting in case things go wrong. Also, mention of non-Microsoft resources in this post does not imply that Microsoft supports them.