I think I heard Paul Scheele reccommend that you should change the position of the headphones once and a while (left-left & right-right, then left-right & right-left). Actualy, I'm left handed and left brain dominant in my thinking, so you never know. The old assumptions don't always work!
Check out Brain Works (can't remmenber the url), they've got a nice little program that'll evaluate your brain dominance.
