Customs Around the World

Argentina Customs
Chinese Body Language
Chinese Emotion and Gesture non-verbal communication
Culture and Customs of China
Conduct Unbecoming what not to do in Brazil
Customs of Le Marche how to behave in central Italy
Encyclopedia of Days descriptions of holidays from all over the world, 

grouped alphabetically by country, religion, or topic
Everyday Eating Customs in China
Executive Planet designed for business, but a great roundup of formal international etiquette
Finish Customs and Manners
Getting Through Customs not what to do at the airport but quite a few articles on local culture
UK The Great Britain Mystery Tour odd customs and events calendar
Hawai'i - The People, Culture and Language
The History of Eating Utensils the birth of chopsticks, spoons and folding forks
Japanese Customs
Japanese Etiquette
The Lore of Chopsticks
Malaysia Etiquette
Manners Mom Never Taught You business etiquette in the US
Culture of Nepal
Never Give a Mandarin a Clock a guide to gift-giving, an article from Business Week Magazine
Russia - Etiquette and Local Customs
Saudi Arabia Customs for Business
Cursing in Swedish
The Alternative Dictionaries slang from around the world
Things Foreigners Can Do to Embarrass Themselves in Japan
Vietnamese Names
Vulgarity and Insults: A Cross-Cultural Perspective
The Web of Culture body etiquette from all over - requires free registration
Worldwide Holidays and Festivals
World Observances holidays everywhere - slightly more pagan