black-tipped reef shark
My wife has a tattoo of one of these on her shoulder blade.
UPDATE: An artist (Roger Hall) contacted me about creating a fine art drawing of this shark. The finished product is here. Check it out, I think it looks awesome!! :-D
If you like it (or any of Roger's other drawings) he sells them as well.
Edit 8/4/10 - Found out that this photo is featured in a Discovery News article!!
Edit 12/7/10 - Photo was used in an article on how sharks help us (humans) breathe better. Keen!!