This isn't really game-related, but it's certainly AI-related. There are a lot of "learning" IRC bots that don't really "learn" anything, so much as just build a big database of responses to phrases. It's more just language analysis; say something similar to what someone else said before, and it'll repeat what someone replied to it. Are there any that really (at least try to) learn and simulate an actual brain? I realize brains are no simple matter and there are pretty severe limits to what computers can do in that regard, but I'd be interested to see how well one could actually perform in the right circumstances. Needs to be open-source so I can tinker with it as well. :)