A basic bot
A basic bot demonstrating the basics of PoCo-IRC.
Add translating capabilities to your bot.
Have your bot resolve DNS records for you.
Allow your bot to talk, using artificial intelligence.
Implement the seen feature found in many bots, which tells you when your bot
last saw a particular user, and what they were doing/saying.
Structure your code in such a way that your bot can be reprogrammed at runtime
without reconnecting to the IRC server.
Use your bot as an RSS/Atom feed aggregator.
Have your bot remind you about something at a later time.
Have your bot deliver messages to users as soon as they become active.
Have your bot evaluate mathematical expressions and code.