This is a fun site. You do have to register your email address and set up a password but there's no obligation.
Upload a large, front facing photo and the facial recognition software will tell you which celebrities (male and female) you most resemble. The results can be hilarious! Apparently I'm a match with Notorious B.I.G and Marcia Cross??!!
There is also a Looklike-o-meter for parents and their kids to see whom the kids most resemble - haven't tried that one yet but looks like fun.