Apart being friendly, helpful people, the following people are working on useful and interesting projects in Java gaming..

Caspian Prince (princec) - focusing on highly polished 2D games in Java over at PuppyGames. (also see LWJGL)

elias_naur - A member of OddLabs who have produced the wonderful Tribal Trouble 3D RTS and are rumoured to be working on their next project. (also see LWJGL)

Mazon - A maintainer of the popular LWJGL library - the man to talk to when a new build is out.

Mojomonkey - Now works for NCSoft but still working on the Java Monkey Engine scenegraph based games engine.

Endolf/Jez - Maintainer of the JInput libraries for game controller support in java and long time devotee of his project Dark Void

DarkProphet - Initiater of JME-Physics, and in the process of building the Volatile Engine, a new technology focused scenegraph based engine.

Matthias Mann - Building the Worldscape system, a terrain and rendering engine that utilises shaders heavily for peak performance.

Shawn Kendall - An instructor at the Full Sail games development college. Also the developer of Cosmic Birdie a kick ass racing in game in progress.

Markus Persson - Developer of Wurm Online and all round java coding genius.

Did I forget you? Did I get it wrong? Well, let me know then!