Some of them are still around, they pop in from time to time.
There aren't many people left that know much about NovaWorld. I got as far as doing lobbies for all the games up until JO as it uses a little bit more complex system. Thor (NovaWorld.cc) and I have both been playing with trying to replicate a full NovaWorld for JO/DFX/DFX2. It's a bit more time consuming and my time during the summer is more limited..
What languages do you use? I've decoded the GLB files for BHD/JO/C4 but haven't really played with DFX or DFX2 yet. If you know how to do that type of stuff you're more then welcome to help
. Do you have any sort of messenger? Facebook?