Hi, I've got a strong Mac background and a 2 year history with SolidWorks. I have one of the new Mac PowerBooks with the Intel Duo processor & 2 GB Ram. Here are my observations: 1) graphics card works great - I believe the Mac has 256 mb vram - but RealView doesn't work. 2) I wouldn't use Virtual PC. BootCamp is pretty good, but it's still in beta. Minor anoyances - some keyboard commands don't work - delete key, etc (BootCamp 1.1 was supposed to fix this, but it didn't) - but the right mouse button still works fine. My only other frustration was that there is no driver yet for an external monitor (in fact Windows won't even boot with the external monitor plugged in - serious issues).
So the PowerBook is my backup when I travel, but not my everyday machine. For everyday use I would wait until the next Mac OS comes out (probably announced in Jan at MacWorld).