OK, another great idea from Cool Cat Teacher–this time it's a wiki for keeping notes for your class. All of you take classes that require you to take notes of lectures and readings. So why not keep notes on a wiki which you and your classmates can collaborate on? Miss a class? Don't worry–others were there and got the notes. Couldn't keep up with a particularly thorny point? Someone else did, and they can add it to the wiki. Couldn't follow an unexpected turn in a classroom demonstration? Someone else got it. Just plain got something wrong? Someone else got it right. Go here to see an example of Viki Davis' notes on a class she's taking.
This is a great idea for a project: set up a note-taking wiki for another class that you are taking, and get your other classmates involved in building it and using it so that all of you will do better in the class. Invite the teacher to check in on it to correct errors or expand on particular points. They'll do that if they are really interested in your learning. Go for it.