I'm cross-dominant :P. I have to use my left hand for certain things and have to use my right hand for other things[I can use either hands for certain things though]
sports: most sports I play lefty
writing: about uqually well with both but I use my right hand 99% of the time
Wii: I hold wiimote in left hand
ds stylus: right
drawing: right
opening things/doors: left
etc.
Half the people who say they're ambidextrious aren't because it's very rare. If you're ambidexrious it means you can do EVERYTHING with EITHER side PERFECTLY with right or left.