WinXP RC1 install was too easy. Every single device was recognized (including 6 year old laser printer, scanner, NIC, burner, etc.) I've both Win2K Pro and WinXP on my box and WinXP loads much faster even though it's sitting on a slower slave HD.
Got XP on my sandbox laptop at work. If you have a laptop and a docking station, you MUST get the XP. Anyone with a laptop knows how pathetic dock/undock feature was on Win2k. With XP, I can undock, take it home and work on a document offline, re-dock back at work and WinXP will sync back up to the network. No reboot required to get on the intranet like Win2k.
There are still several apps that I can't run on XP yet including EasyCD and Webwasher.