I found this interesting article on MSNBC.com today. It lists the different 'tip' customs around the world. Here in the US it's said that you should tip restaurant servers at least 15%, but more 17-20% of the check prior to tax. That amount is for GOOD to EXCELLENT service. I know there are those occasions I've left less. One thing to watch for here in South Florida…especially on the beaches…is an added tip. Many restaurants add a 'service fee' or 'tip' automatically…even on solo diners' checks. You probably don't want to double tip so be sure to review your check.

Here is a guide to restaurant server tipping all over the world:
Restaurant - The United States: 15% - 20%
Bar - The United States: 10% - 15%. You might want to stick to $1 for a beer, $2 for a mixed drink.
Restaurant - Canada: 15% - 20%
Bar - Canada: 10% - 15%. You might want to stick to $1 for a beer, $2 for a mixed drink.
Restaurant - Central & South America (Argentina, Chile, and Uruguay): 10% - 15%
Restaurant - Central & South America (Costa Rica, Brazil, and Peru): Most include tip/service charge automatically.
Bar - Central & South America: NONE for drinks alone. 10% if food is served.
Restaurant - Mexico: 15% (except for super casual…like a taco stand)
Bar - Mexico: 10 - 15%
Restaurant - Caribbean: 15%
Bar - Caribbean: 10 - 15%
Restaurant - Europe: Most servers are paid FULL salaries. 10% at your discretion if service is exceptional. It is not required.
Bar - Europe: None. Most round up and just leave the change/coins.
Restaurant - Asia (Thailand, Singapore, and China): tips are not expected.
Restaurant - Asia (Hong Kong): 5% optional on top of 10% service charge.
Bar - Asia: not customary in Japan and China. 10% optional in other areas.
Restaurant - New Zealand, Australia: 5% - 10% only if you are extremely pleased with service.
Bar - New Zealand, Australia: up to 10% if you are feeling generous. Normally none is left.
Restaurant - Africa and Middle East: up to 10%.
Bar - Africa and Middle East: up to 10%.