A Zotonic powered chatroom.
If you are young you probably won't know what a chatroom is. They were how people interacted on the web before the 2.0.
I remember we used to have the Virtual Irish Pub, Oceanfree and Widemouth in Ireland.
Anyhow, as an exercise in finding out how to do some fancy real-time stuff with Zotonic I decided to write a simple chatroom. It does absolutely no logging, it just takes the messages you type in and sends them directly to all the other connected clients. If you are not connected at the time of a message you will never see it.
I might modify it when I get a chance to do some logging, and also to look a bit better by default.
I borrowed a lot from mod_logging when writing this.
See the demo (requires login with facebook)