Interesting or Worthwhile Links Related to Tipping
MegaTips 2 - an updated and expanded manual for servers describing scientifically tested ways to increase your tips
Celebrity Tipping - info about the tipping habits of celebrities
International Tipping Norms - info about tipping norms in 70 countries
Link to a recent interview I did with Zale Mednik for his podcast Preconceived.
Link to another interesting podcast on tipping at Gastropod.