Comparison of tipping at restaurants in Australia and the United States.

American and international norms.

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 of 15, 20 and 25 percent. [Requires free nytimes.com registration to view.]

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.

Sells tip cards that consumers can use in restaurants to help them figure out an appropriate service tip.

Etiquette for when pizza is delivered. Ways to speed up the delivery time and make pizza delivery more enjoyable.

The people hired to work at weddings often get tipped. Here's a guide.

Scholarly article. Answers why it is customary to tip a larger number of service professions in some countries than in others.

A guide for most tipping opportunities, including travel, restaurants, weddings, salons and Christmas.

A completely unofficial guide to restaurant and café tipping.