Last night I tried out Wurm Online for the first time. Wurm Online is a MMORPG (like Everquest or Ultima Online) written entirely in java. I spotted it on the latest Swing Sightings. WO is at a very early alpha state. But, none-the-less...WOW. This thing will knock your socks off. It totally blows away any concept of Java being strictly a server-side technology. The 3D world looks great, and the client runs well.

The client is a Java Webstart client, so you can easily launch it from their website. Not only that, but client updates are automatic.

Best of all, since it is Java, it will work on any system that supports OpenGL, including Linux and MacOS. That's something EQ and UO could never boast. I highly recommend trying it out. It will only take a couple of minutes to get up and running, and as long as you have Java WebStart set up, it won't take any more than clicking a link and typing in a username from you.