Is this the official beta release of Windows 7? Build 7000? I've been testing Windows 7 build 6956 and it's been working fine so far. I was not impressed when I installed it on my Samsung Q1 Ultra UMCP.
I'm eager to see how build 7000 performs. If it's similar to 6956 (which is what I suspect), then I don't think it will be suitable for an under-powered UMPC like my Samsung Q1 Ultra. However, if it's more similar to XP (which I doubt), then I may be pleasantly surprised. In the meanwhile, I will continue to test Windows 7 on some old machines.