We have started a project called Ink (ink.stanford.edu). We are looking for people to create Ink tutorials. Your tutorial can be on any subject you like, just email us at ink@cs.stanford.edu with your proposed subject and we'll get back to you. If we ask you to go ahead and create your tutorial we will pay you $20 once its done.

See examples here: http://ink.stanford.edu

The plus side is that you can also make money from an Ink tutorial. You can offer to help people who read your tutorial, for example:

Email us with your ideas! What can you help your fellow students with and earn some extra cash?
ink@cs.stanford.edu