About half our computers at work use XP, the rest Windows7 (can't find anyone using Vista ). I use XP at home and have at work since forever. It's stable and comfortable. Win7 makes it tougher to do some things, and the apparent Microsoft attitude of 'don't worry your little head about it - we know what you want' does make it difficult for those of us weaned on the command line and actually know exactly what we want to do and in what order.

The old addage 'Never buy version 1.0 of anything' applies here, as always.