Use common sense, don't be a jerk. Remember we are all in this together.
Examples:
- Don't flood
- Don't racist
- Don't spam
- Don't harass
- No 1337 Scripts
- No bots in the main chan without prior agreement
- Use english as a common language
- And don't forget to enjoy yourself, because it's later than you think
Scope: official IRC channels, mail, wiki