From the about page…

“… I sit here thinking about what it means to be a part of something like this – an endless, senseless, interactive book – and i come to the conclusion that it’s really a very cool thing. To have tons of random people just vomit out what’s on their minds at the moment – kind of connects them all, just for a second, y’know?…”

“… These plots with no endings and interrupted by small snippets of other people’s thoughts and worlds… It’s very much like life, but who said that art could imitate life and still make sense? …”

The unfortunate part is that spammers sometimes put in garbage, but I guess that it is all part of the collaboration.

• Twiddla
• Skrbl (it must be Web 2.0 since it is missing its vowels)

Both allow users to create and share online “whiteboards” with freehand drawing, text, pictures and such. Worth a look.