I deleted my Boot Camp partition on my MacBook Pro today. Once I started using Parallels for virtualization, there was no point. Now when I need to use Windows I don't have to reboot, I can share files, and I don't have to occupy some part of the hard disk with a partition that's partially unused. Sure, Parallels wasn't free, but it's a much nicer arrangement.
Actually, one of the neatest things is just that I can have a totally ready to go install of Windows XP that I can deploy anytime, make copies of, etc. That's pretty cool.