The game of 21 is known by the names of Blackjack, Twenty-one, Vingt-et-un, and Pontoon, and probably other names as well.

The following link covers the following:

• The game description.
• How to play.
• The game rules.
• Strategies.
• Some history of this game.
• Well known people involved with the game.
• References to many literture.
• Variations in the rules.
• Odds.
• Counting.
• Shuffling.

http://en.wikipedia.org/wiki/Blackjack


In addition to the Blackjack, there is now Ultimate Blackjack/Elimination Blackjack.
Review other posting for info on Ultimate Blackjack.
Also, you can go an view it in action, and try it here:
Ultimate Blackjack provider