Work is in progress for the next Google AI Challenge and I've been working on the Common Lisp starter package. At the request of the organizers the starter package has been made very basic.
A more extensive starter package with proxy-bot functionality is available at: http://github.com/aerique/google-ai-challenge-2011-1-ants/.
Proxy-bot functionality is meant to allow for more Lisp-like development of your bot. You can keep your actual bot running in, for example, a Slime session while the proxy-bot is started up and killed by the game server. The proxy-bot connects to your actual bot in the Slime session to play the game, ie. it just passes on state and orders between the game server and your actual bot.