I still think that the mirror project is a very cool experiment in self-portraiture. Recently some other great portrait experiments have been brought to my attention. This guy takes a picture of himself every day while Nikki S. Lee was dressing up and assuming new identities - and documenting them.

My current favorite concept though is not about self-portraits, but rather, secret portraits. Simon Hogsberg took photos of unsuspecting subjects in London over the course of a year. He has organized these into seasons. Brilliant.