Virtual PC 2007 RC1 has been released, and can be downloaded on the Microsoft Connect site, if you participated in the beta tests. The main new features are:

• Support for Windows Vista™ as a host operating system
• Support for Windows Vista™  as a guest operating system
• Support for 64-bit host operating systems
• Support for hardware-assisted virtualization
• Built-in support for network installations

More details about the release notes can also be downloaded on the Microsoft Connect site.