Totally right-handed. The only thing my left hand is good at is analog sticks -- I can't do the nunchuk for crap in my right hand. I might hold a bat left-handedly when I'm playing baseball, but that's only because I'm completely inept at sports and don't know which way is which.
On a related note, who here can do the Vulcan salute? I couldn't originally, but many years ago I started putting a golf ball between my middle and ring fingers for a couple days in a row (not all day, but for a while each day), and ever since then I've been able to do it easily with both hands. If you can't do it and you want to, there's a suggestion.