Something else for the investigate-properly-sometime list: Curl Surge. It demos well, and the language seems quite elegant. I've not dug far enough yet to see whether we can easily plug Surge inside Groove; if that's possible, it might make a good platform for the types of user interface I'd like to created.

Question: can you integrate Java applets into Groove tools?
Answer: yes, I think so. By embedding the applet on a local Web page and using the same loosely-coupled event passing used by PinBoard. But this won't solve the data access problem (ie. the applet can't talk natively to Groove's storage). Needs a proof of concept sometime...