So I installed Windows 7 (pre-beta) on my Samsung Q1 Ultra UMPC. I must have had very high hopes because I was so disappointed. Windows 7 so was so much slower than Vista on this machine. I was expecting quite the opposite because of all the buzz that Windows 7 was so much faster than Vista, especially for netbooks. I have Windows 7 running on an old desktop and it seems to run OK. I'm not extremely impressed, but Windows 7 seems to have some nice features associated with it. Of course, I realize that this pre-beta is still extremely preliminary, so I'm willing to give this another try with the next build of Windows 7.
I've now uninstalled Windows 7 and I'm waiting for the next version before I do this again. In the meanwhile, I'll be running XP tablet and I'll probably reload Vista since I've split the partition on my hard drive.