Card Games

Card Games by John McLeod
A collection of dozens of card game rules arranged alphabetically, categorically, and geographically.
http://www.pagat.com/

USPlaying Card Company: Children's Card Games
Has instructions on how to teach children how to play card games, and the rules for several games for children from 4 to 12 years old. Gives the number of players, suggested age range, and skill level for each game.
http://www.usplayingcard.com/gamerules/childrenscardgames.html