Hey,
I'm doing this right now and mine is totally slick; I mean really good. I have the new MacBook (not Pro, the regular one) with 2 Ghz Dual Core Intel, 667 Mhz FSB, 1 GB RAM, 60 GB hard drive, Superdrive DVD Burner, 250 GB External Hard Drive (Western Digital Lighted Drive w/USB 2/Firewire). I installed Boot Camp last Friday evening and Windows XP SP 2 after that, allocating 10 GB of the MAC drive for the Windows Partition. I've also got Windows tuned a little better for audio (http://www.musicxp.net/tuning_tips.php). So far the ONLY thing that has not worked is the Windows clock and the iSight camera.
My resource use has been pretty low compared to my old machine. My projects are not super complex, but not bare bones either. I just ran a project with about three virtual instruments, BFD (not frozen this time), about three mono guitar tracks and two stereo keyboard tracks. For kicks I added two Cakewalk plugins in each individual audio channel just to see what it would do, and processor use was around 20-30%; occasionally it would go up a little higher. I've got Waves Native PowerPack still yet to authorize on this system, so that will be next.
It renders everything really quickly; basically everything is noticeably faster. I was using a Dell Dimension 4300, 1.6 Ghz P4, 1 GB RAM, EIDE system drive (60 GB) and audio drive (80 GB). My audio interface it a Tascam FW-1804, but I just picked up an Ozonic that I want to play with a little more. I may use it for portability and laying down instruments. The headphones and preamps didn't fare well compared to the Tascam.
Thanks!
Donny