Check it out: http://www.gethostile.com
It’s a financial game similar to the classic board game Acquire. Simple game, hard to master. Lots of fun.
It’s running on Java 1.5 and uses DWR for AJAX communication.
Mmm DWR… I’m using that right now, pretty cool stuff. Makes for some nice looking web pages. Yours is simple but it updates fast and is easy to use and I like it 
No time to play game now though, but will try it later.