I don't patch my tubes, because all but one flat have been in places impossible to patch. I should probably pick up a patch kit next time I'm at the LBS (or with my next TE order), just to be on the safe side...I just need to find somewhere in my seat bag to put it!

DBF doesn't patch his tubes (he says it's not practical), but I think the real reason is that he rides in groups and is pretty much guaranteed to have someone to bum a tube from.