Virtual PC is in the wild, it's supported on Vista, it runs Vista in a virtual environment, and best of all, it's incredibly cost effective a.k.a free. It's also got a shiny new website - well, I tell a lie (they don't come out often...!) it's not got it's own site, but has slipped secretly into the downloads section of the Windows site.
So, what does it give you? Well, here's the official description: "Virtual PC 2007 is a powerful software virtualisation solution that allows you to run multiple PC-based operating systems simultaneously on one workstation, providing a safety net to maintain compatibility with legacy applications while you migrate to a new operating system. It also saves reconfiguration time, so your support, development, and training staff can work more efficiently".
For me, VPC is a god send - I can really tinker with a machine and not have to worry about breaking it! Excellent! It really is a great addition to your arsenal, especially when you want to test application compatibility for example.
Download VPC 2007 here
More VPC 2007 Resources: