I minimized my Mt. Gox account several months ago.  The warning signs were starting to pop up.  Hedged my bets by taking half as a wire (fail!) and moving half of the BTC away to capitalize in via different route.  Not that I ever thought that a complete collapse was likely at that time (or even now, for that matter) but why take a chance?

Was the same with Bitcoinica.  Some crook got 2 or 3 BTC of mine.  At the time it was effectively nothing, but as the price goes up it's kinda starting to piss me off on principle.  Oh well.