Gah. Keep XP for that puppy. That Celeron has only 128k of L2 cache, and it's deliberately crippled in terms of latency as well. Win7 is a very good OS, and more efficient for sure than Vista, but Celeron 900 + 64gb of ram would still suck.
I know the Aero display would be out, which I could live with, and I didn't think about the L2 cache deal. I found some eee forums out there where people did put it on a 900 Cely and it seemed like some had good luck, and others got it to install but wound up with goofy long boot times of 15 minutes.
I have a free upgrade from the university so I won't have to shell out cash for it, so I am pretty damned curious. To do it right I would need to do the full wipe then install, but I am not so sure how curious I am to take the time to wipe my drive, install Windows 7 and revert back to XP if I need to.
I can always put it on my main desktop replacement notebook (monster 17" Dell) that meets the requirement, but I usually use my little netbook more than my "main" notebook and as such wanted to see if Windows 7 would be any improvement on it.