I'm using Ubuntu 9.04 - the Jaunty Jackalope, on my laptop, and it's great...
Only have a few Windows programs via wine, and they are also working
fast, some even faster than in Windows, lol!
I like Windows 7 though, it very sleek and fast on my Gaming PC, but i wouldn't
change Ubuntu on my laptop.. It's realy fast, and apps are free, it's ideal for Web
development, and that's what i'm using it for mostly..