BerryBots demo
I haven't had a chance to try it out yet, but I think it would really help to have some sort of basic GUI launcher which enumerates the different battle type options and bots available (with brief descriptions), and then arranges the command line arguments with the options you've selected. Once you have that I'd suggest emailing the people at the Raspberry Pi foundation and they'll put it on their homepage blog - it would be a quick way to get a bunch of people interested and to get the word out. I also think it would be fine to have something on the Robowiki homepage saying something like "Is Robocode running slowly on your Raspberry Pi? Try out BerryBots <link>!"
The full GUI version is the next thing I'm working on. It has a battle launcher like Robocode, during battle it has ship (or team) names and health on the left that link to their individual output consoles. Right now I'm building on the Mac with XCode but wxWidgets should be portable to Linux and Windows. But I thought the Rpi version would stick with just the command line interface, actually. It just feels appropriately minimal and lightweight. Maybe I could make a totally different UI if the wxWidgets stuff doesn't port to the Rpi well.
About the homepage link, I'm hesitant to spam the RoboWiki with some new game of my own. ;) I posted in the Rpi Gaming forum, not sure how much that will get the word out.
I was thinking of a super-lightweight GUI being almost a command-builder which you then click 'execute' and it runs. That way it could teach you the command line layout while still being something that exposes all the options and allows Raspberry Pi/Linux beginners to access the full functionality without having to read scary man pages =)