I just came across this site today and thought I would share it. Its only in certain cities, but looks like its expanding.
I was looking around trying to find something for a friend of mine who is having some health issues and not currently able to work on a consistent basis, but she has some skills to do small tasks for people like errands, mending clothes, etc.
I personally think its a very cool idea both for people who need to make some extra cash and have certain skills and for people who need help with different tasks.
Task Rabbit
How to Become a Task Rabbit