Windows XP at home, Mac OS X Leopard at work - both ver useful imo and I wouldn't ever want to go exclusive again!
Edit: use utorrent exclusively on windows btw!
P.S. Used to use Linux 7.10 but my hard drive was too small so I kick-banned it for now.... it is faster than both XP and mac though - like the best of both (can you say compiz ), but it'll have to wait a bit!
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