If you were looking for a fun project, to get involved with some cool tech. It doesn't get much better than contribute to UberFire :).
The best place to contact us is via IRC, where we'll talk you through code, and get you started. Just make sure to use our nicks when asking Qs, so we get notified - ask for porcelli, manstis, salaboy or conan on the #droolsdev channel.
Here are some components that would be very helpful:
Errai JSON Tree Editor
Grid/Tile layout manager for panels
Wiki Engine based on Markdown
Drop Panels outside parents