Funny, I AM running XP on a 1GHz celeron laptop (with 384mb ram) and, although I was impressed with the performance increase between vanilla-XP and when-I'd-turned-off-the-bells-and-whistles XP - now I'm used to it I rather miss W2K (which is on my desktop).
A lot of this is down to the fact that the hard drive will only run at PI0 mode even though it is capable of UDMA4 (and yes, I have enabled DMA in both BIOS and device manager - I also tried deleting and reinstalling the primary IDE bus - no effect).
So I'm still weighing up W2K - WXP? Which is less annoying?
WXP will barely function with less than 256MB memory, Windows 2000 was reasonably happy with 128MB+.
The wizards actually seem to work in XP, however doing things manually seems much harder than previous generations. Which is a turnaround - after X-generations of windows where I'm used to doing things manually with the wizards being an annoyance, I find I now HAVE to use the wizards, and I don't like this.
The rollback feature is a plus - but I'll use this once a year, so it's not a deciding factor.
Drivers included with WXP are a plus, but Driverguide is only a click away.
With a 1.86GHZ/533fsb/2Mb cache dothan running with 1GB memory using Windows 2000 it is by far the best machine I've ever had, and better than most I've ever used. Think I'll stick with 2k until something requires I upgrade.