interesting how they have to Windows Se7en logo like that with the 7 in the middle, kinda looks like one of the old Mac OS logos...
But no I have not used Windows 7, even though I've heard that everyone like the beta, I would like to wait until its officially released and see how it is(MS might change it or add-on a lot of crapware to it, but that is usual for a new computer, has a lot of trialware)