This Tech Soup article caught my eye. It distingiushes the process of upgrading to Windows 7 with the two terms in-place upgrade and custom-install upgrade...
This is admittedly NOT nonprofit related. But I thought some of you might be interested to know you can get Windows 7 Professional for just $30 from Microsoft.
If you're running Vista, BUY THIS NOW. Windows 7 runs noticeably faster in my experience than Vista on the same hardware.
If you're running Windows 7 Home, it's not as big of a deal (if you're on XP, it can get messy to upgrade. Ask me if you have questions).
Andy