Can't wait till the Christmas holiday. I'm going to get my hands dirty with some of this stuff.
http://rumpetroll.com/
You get to chat and swim about as what's supposed to be a tadpole, looks more like sperm to me. It's really exciting to see proper use being made of canvas, CSS 3 and JavaScript. They use WebSockets to keep a continuous connection to the server, allowing up to 5 updates per second. The future of browser games is on its way. I just don't want to know their hosting bill at the end of the year
PS. I recommend you download Opera 11.