Windows 7 has to be the best Windows yet. It is much faster than Vista (despite what the experts say). The install has to be the easiest of any Windows to date. And the look and feel is just much better than Vista. In fact, I have moved my taskbar and start menu to the top of the screen to have more of an Ubuntu feel than that of thoe traditional Windows feel.
The 64bit version appears to be the best with the least amount of issues with drivers and hardware. The 32bit is also good, but lacks the perfection found in 64 bit.
Memory: Windows 7 64 bit comes to life past 4 Gig of ram. Memory is relatively cheap so stock up and enjoy the pain free love of Windows 7. As far as 32bit Windows7, I have had no problems with my 2 Gig laptop.
Processor: Dual Core, Quad Core, Core i7????? I have found that Windows 7 runs just fine on and older 1.86 GHz Pentium M Centrino with an Intel 945 Graphics chipset. It does not have Aero, but Windows 7 does not need Aero to feel good.
Screen Size: Bigger is always better, but I am doing just fine with Windows 7 on 1366X768. Yea, 1280X800 is the sweet spot and my dual 1980X1200 24" monitors rock. But this OS works just fine with smaller screens.
Compatibility and Drivers: I have not found a piece of hardware that would not work with Windows 7. Printers, scanners, sound cards, video cards, all appear to work just fine. If the hardware worked on Vista, it will work on Windows 7.
So more is to come with the testing. I need to look into XP Compatibility mode and running Office 2003 in a virtual environment. After mixing 2007 and 2003 on the same PC for the last 2 year, that mistake will not be repeated.