I'm late to this party.
FWIW I was using Macs for my photography from the outset of OS X, and PC's for business. (Which is writing software for Windows).
When the intel macs came out I fiddled about with bootcamp. parallels and fusion.
Now we don't have a pc in the business - only macs - using an OSX server - which is a mac pro, and also runs Ubunto and Windows server 2008 (in fusion virtual pc's).
XP on fusion is completely fab - we have almost no crashing problems, it runs quickly and reliably, and it's great to be able to back up a whole pc to the server and copy it to any other machine. Not to mentioning travelling abroad with it backed up onto an ipod . . . if the mac were to die, then you can just buy a new one, copy the virtual machine back and carry on as before. . . It's never happened, but it certainly is a comfort if you're working hundreds of miles from home.
VMware are really helpful, and although not as flashy as parallels, it works really well.
As I say, I work with Windows every day, Xp is okay, Vista is a dog, but Windows 7 is looking good.
But the idea of going back to running it on PC's is absolute anathema. The very thought of it sends shivers down my spine!
Good luck with your new 17" - I'm jealous (I had one of the old ones, but I travel a lot, and the extra size and weight is a pain). As Jack says, photography on the glossy screens on the new unibody 15", although not perfect, is reasonably okay when on the road (you just have to make sure you don't have a window behind you!).