Right handed.
There's plenty I do with my left hand- I juggle, type, prepare food. I can even write with my left hand (and have, on occasion, when I wanted to disguise my handwriting), but it's slower and messier. I'd be sorry to lose my left hand, but if I had to choose- sorry, Lefty.
Oh, and speaking of such things- I've heard people insist that the "proper" way to eat foods (like meat) that have to be cut up is to cut with the right hand while using a fork in the left to hold the food steady, then switch hands (fork back into the right hand, knife into the left) to eat the bite that's been cut. This has always seemed like an insane inefficiency to me that no one has any right to suggest is etiquette; if my fork is in my left hand, it's staying in my left hand to eat what I've cut.