At work:
80% Windows XP
15% Linux (which depends on whether you count using Windows to telnet
to Linux as using linux)
5% other (embedded OSes)

This is because two of the required tools that we have to use to track
work run only on windows, as well as some niche compilers & license
thingies too. Actually, one of the most common things at work is a
dosbox, even though it runs winxp.

At home:
75% Linux
25% Windows 2000
Windows is just the gaming rig, couldn't be arsed to set the games up
on linux yet (although I strongly suspect one at least can run in
Linux).
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