Over here, you can watch Matt Bell write a short story. The actual writing is over, but by clicking the arrow at the top of the page, you can see Bell self-edit his story as he types it out.

It's interesting to see a private process like this; I bet someday soon, you'll be able to "watch" a writer type and edit an entire novel in real-ish time as an e-book extra feature.

If you're more of a do-er than an observer, you can write magnetic poetry over here. There are other collaborators, though, so you might find a word has been stolen from your poem by someone else on the internet.

(The Matt Bell link is from Galleycat; hat tip to Book Patrol for the Magnetic Poetry link.)