This Q project looks promising, it is a Cocoa port of QEMU, but looks so much like VPC though I hope they don't get the legal smackdown. It's easier to be able to emulate than have to dual-boot, so let's hope this, and the potential of a WINE port that really works on OS X could be just around the corner. Linux, Windows running in a virtualized environment would be nice. There's still no word as to whether Virtual PC will run on Intel Macs any time soon.