OK, the most basic rule to follow is Wheaton's Law.  Simple, direct, and not something I really worry about with this bunch. :)

But since I know (most of) you guys better than you know each other...

1. If someone writes something that could be taken two ways, and one of those ways offends you... assume they meant it the other way.

2. Be kind to each other.

3. Have fun!

4. When in doubt, ask for help.