I've always wanted to do this too, but I'm too flaky of a person to stick with it. I think I'll give it a shot and see how far I get, though. I always love reading everyone's plot ideas.
For a while, I wasn't planning on joining this year (for the first time in seven years). But, I decided to use one of my recent story ideas and try despite my inability to focus as of late on my usual things that I do. It will be fun!