Here's the bummer of a problem that busts your high with your new Intel Mac: Virtual PC 7 (VPC7) won't run on Intel Macs, and it won't be updated. But here's the upside: Do not buy a new Windows XP or Windows XP Pro if you already have it in Virtual PC 7. You can use your VPC7 version in Parallels with ease. It's as simple as using Parallels Transporter feature (thanks to this post for helping me find the answer!).
You can use your old VPC7 document (Windows XP Pro, or whatever you called it) from your previous Mac (Power PC, G4), or you can create an entirely new VPC7 document to save space so you can burn it to a a DVD. If you do create a new VPC7 document, do not add the VPC7 additions that it will eventually ask about during install and restart -- you won't need them any way. Either way, you'll find the VPC7 file in the folder Virtual PC, in Documents.
Here's all you need to do:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20070422184656709