IRC
Join #xpilot-ai on irc.oftc.net:6667.
Mailing lists
There are some mailing lists available at http://lists.xpilot-ai.org/mailman/listinfo. The dev mailing list is for general discussion of Xpilot-AI. The contest mailing list is specifically for submissions and questions for Xpilot-AI competitions.
Xpilot Servers
If you would like to play Xpilot, there is a server being run at xpilot-ai.org. Feel free to test your bots against human players on this channel.