http://fileforum.betanews.com/detail/Microsoft_Windows_Vista_Upgrade_Advisor/1147972588/1
im about to throw vista on my 4 year old x1000 :)
remarkable its held up this well.. probably wont run very well without the dx9 / glass but well see :)
The big problem with that machine is the Radeon 9200 (9000). Everything else in the machine should meet or exceed the requirements for Vista. I was a little disappointed by that, but I've since moved on to a new ThinkPad and it runs Vista great. Overall, I think I actually like Vista, but only time will tell.