NYTimes.com - Tips Past the Tipping Point  
   A chart that has been showing up lately on restaurant credit card receipts all over the United States does more than spare you the math. Going against typical tipping custom, it suggests tips calculated on the total bill, including the tax, and in amounts
   http://www.nytimes.com/2002/09/25/dining/25TIPS.html

Original Tipping Page  
   Information on what is considered proper tipping etiquette in different situations such as skycaps, hair salons, casinos, cruises, disc jockeys, hotels, limousines, restaurants, trains and taxis.
   http://www.tipping.org/

An Aussie in America - Tipping  
   Comparison of tipping at restaurants in Australia and the United States.
   http://www.aussieinamerica.com/eating/tipping.htm

Tips on Tipping  
   A completely unofficial guide to restaurant and café tipping.
   http://www.stratsplace.com/rogov/tips_on_tipping.html

Tipping Customs and Status Seeking: A Cross-Country Study  
   Scholarly article. Answers why it is customary to tip a larger number of service professions in some countries than in others.
   http://www.hotelschool.cornell.edu/chr/research/inbrief/customs.html

CNN.com - Here's a tip: Get a grip on gratuities  
   American and international norms.
   http://www.cnn.com/2001/TRAVEL/NEWS/06/25/tipping.adviser/

Tipping - Wedding Etiquette  
   The people hired to work at weddings often get tipped. Here's a guide.
   http://www.ourmarriage.com/html/tipping.html

Tipping Etiquette  
   A guide for most tipping opportunities, including travel, restaurants, weddings, salons and Christmas.
   http://www.findalink.net/tippingetiquette.php

Tip Table  
   Sells tip cards that consumers can use in restaurants to help them figure out an appropriate service tip.
   http://tiptable.com

Tip the Pizza Driver  
   Etiquette for when pizza is delivered. Ways to speed up the delivery time and make pizza delivery more enjoyable.
   http://tipthepizzaguy.com/