We had a bit of a play with the Windows 7 Beta recently which is kinda fun. It didnt leap of the screen as being dramatically new, there are a few UI changes (the new taskbar is neat and seems to work nicely). It does seem to be a 'refinement' of Vista I guess and that IS good. We didnt test the 64-bit goodness which is another direction that I am keen to walk down.
I still have possible plans to arm myself with a gaming laptop for play and some 3D dev work and the choice of OS would be interesting there - esp when Windows7 eventually hits the shelves.
Check out Gizmodo's coverage of Windows 7 and particularly the new taskbar.
[Windows 7 desktop via Gizmodo]