I always wanted to be a catcher, especially when I was a teenager (20+ years ago), but being left-handed essentially killed that dream. I've always ended up playing OF or 2B, with a little bit of P at times. I was never all that good anyway- I always felt like I was more of a Gene Mauch or Earl Weaver- one of those that knew the game a heck of a lot better than they could play. I never understood why it makes a difference at C, but here's a great article for us lefties.
http://members.tripod.com/bb_catchers/catchers/catchleft.htm