Yahtzee

Dicee! - Dice Poker
Offers a game of Dice Poker. Roll for sets, full houses, straights, and 5-of-a-kind.
http://dicee.newobj.net

Kismet
Rules for a variant of Yahtzee that uses different dice.
http://www.centralconnector.com/GAMES/KISMET.htm

Rules of Yahtzee
Includes all the rules of standard play.
http://grail.sourceforge.net/demo/yahtzee/rules.html

Triple Yahtzee
Rules for a Yahtzee variant.
http://www.centralconnector.com/GAMES/tripleyahtzee.html