I've been toiling with Win2k3 since RC1, and it's actually pretty neat. As far as dual booting goes, the following process has worked for me:
- Clean install of XP on C: Partition. Install all the apps you need and make it pretty, etc.
- Boot to the Win2k3 Server CD, it will detect your WinXP installation and grumble a bit, but as long as you install the NOS to a completely different drive letter (i.e. D),
you'll be fine.
Dual booting isn't nearly as haphazard as it was with NT 4.0; the only real thing you have to be careful of is installing apps to the C: drive when you're working within 2k3 Srvr. This shouldn't happen at all with properly written apps which base their install path on System Environment Variables, but a lot of crappy applications are hard-coded to install to C:\Program Files\blah blah blah.
Hope this helps.