Microsoft now has the upcoming Visual Studio Codename "Orcas" available for download as a Virtual PC Image. This enables you to download and install it without risking damage to your currently installed software. You will need
Virtual PC 2004 SP1 or
Virtual PC 2007 (Windows Vista). The download is quite large, around 6 GB, but for those who can't wait to see C# 3.0 in a safe environment it may be worth it ;)
You can download it from here:
Microsoft Download PageThe download page also has a full feature list, installation instructions and specifications.