Coming this fall by the E-Mail Counting T-Shirt Guy's Wife.....
TURN SIGNAL BIKING JACKETS!
http://www.youtube.com/watch?v=ZtNEPkwCfxA&feature=player_embedded
I'm not really sure if that's his wife, but they would make one hell of a couple.
Heh, funny you should post this. Today I went on my first bicycle ride since getting my real drivers liscence, I noticed that whenever I go to turn, I do a little flicking motion with my index and middle fingers in my left when turning, as they activating the turn signal on a car. Not to mention looking up expecting rearview and side mirrors XD. I could use one of these.