Sorry for the revival of a ancient thread, I was about to make a new topic on this but then I found this one. So I'll just drop my two cents here.
From what I can tell I am semi-ambidextrous, but I'm more tuned to using my Left hand for most actions (only because I like to:P.) To help explain what I'm trying to say here's a small list of what I do with either hand:
Drawing/Painting: I can use either hand, it just depends which gets tired first.
Writing: I prefer using the left hand, I guess I write a little faster this way.
Using tools (example: scissors, knives, power tools, etc.): Right hand mostly
Eating: I use my left hand, but if the meal is big enough I could use both hands, lol. j/k