Please note that you'll have to disable downloading on your client by setting DOWNLOAD=NOT in your roborumble.txt file.
Other useful files:
http://davidalves.net/robocode/particip1v1.txt <--Participants list as of Sept. 2nd
http://davidalves.net/robocode/roborumbleathome_beta1.ZIP <-- client
Heck, use it if you aren't running roborumble at all, it's a great testing base and it's much faster than downloading bots one by one. That said, run roborumble you lazy bum ;) -- Kuuran