Online Tournaments
FunBets - Sports Betting - stock market style (dim#, wiz#)
Game Zone - A great site to play games against other people online (free signup). Many types of games to play (board, action, card, puzzles, simulation, strategy, adventure, arcade, sports). You can play for ratings & ranking or for fun.
Play Site - Another great site to play games against other people online (free signup). Games include chess, checkers, backgammon, reversi, hearts, spades, cribbage, bridge, go-moku, hex, mancala, renju, euchre, tangleword. You can play for ratings & ranking or for fun.
Games.org - Games include: Age of Empires, Descent, Descent 2, Duke Nukem 3-D, Grand Theft Auto, Jedi Knight, JR XWing vs TieFighter, Legal Crime, LinksLS '98 Pro, LinksLS Pro, MechWarrior 2, MechWarrior Mercenaries, Monopoly, Outlaws, Quake, Quake 2, Red Alert, Shadow Warrior, StarCraft, Total Annihilation, Virtual Pool, Virtual Pool 2, Warcraft 2, Warlords 3, XWing vs TieFighter
Excite Games - Games include: Backgammon, Chess, Checkers, Crosswords, Jumble, Sports Crossword, WordSearch, Euchre, Hearts, Solitaire, Spades
Yahoo Games - Games include: Backgammon, Checkers, Chess, Go, Reversi, Crossword (single-player), Yahoops!, Stock Market Challenge, Blackjack, Bridge, Cribbage, Euchre, Gin, Hearts, Pinochle, Poker, Sheepshead, Spades, MahJong.
Infoseek Games - Games include: Spades, Solitaire, Euchre, Hearts, Crossword, Checkers, Chess, Backgammon, Jumble, Word Search.
Iplay - Games include: Spades, Cribbage, Hearts, Gin Rummy, Euchre, Pinochle, Backgammon, Reversi, Go, Seawar, Wordcross, Roller, 10000.
Igames
Total sports - head-to-head java Baseball.
Rjdrivers
Jayde.com - Tons of links (my also belong in (Demos/Games)
TournamentGames.com - Solitare (dim13, ...13)