Lew Bayer, partner at The Civility Group, weighs in on after-dinner etiquette:
Always extend an exit handshake.
Remember to thank the host (at someone's home, offer to help clean up) before you leave and then consider sending a hand written card as well.
If you suggested you'd set up a meeting, or pass on a name, or do something - do it!
Reciprocate - extend an invitation to the host when you plan your next function.