How cool is that - we're releasing Virtual PC 2007 as a free download.  Why should you care?  Here's the things I've found Virtual PC to be useful for:

• Putting a working server/client/multitier configuration on a laptop for demoing
• Testing/debugging setup for RegNamespace (the undo disks are a godsend here).
• Doing something sketchy (e.g.. looking at dancingpigs.exe that your friend emailed you)
• Running lots of different versions of an OS, or multiple different OSes at once

That's what I've found it useful for - it's used for tons of other stuff.  Read more on the Virtual PC site.

[via Robert Burke's blog]