My little TV station is built on OS X, I have 8 xserves running Xsan and a couple dozen or so clients on Mini's and G5 towers. In fact our parent company got hit by a couple of viruses today and while every other division was falling apart we were chugging along happily. I ended up leaving work at 21:30 tonight after patching the few Windows 2000 machines we have, whilst our newspaper arm was pulling an all-nighter to get an edition out for the following day.

I'm sure the day will come when an OSX virus shows it's head. But until that day I will remain smug. In fact, it's added more fuel to the debate about replacing everybody's desktop PC with a Mac.
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Cheers,

Andy M