Clearly left-handed with almost everything I do. Except when using scissors, for the same reason as Clarissa. And I hated can openers until I found one that can be used either way.
Oh, and I control the computer mouse with my right hand. For the first years, my husband and I fought about the "correct" side for the mouse. Since he used it much more often and business-wise by then, I finally gave up and now am used to it.