SynSpades is a free multiplayer card game with 4 tables per channel. Play with partners or free for all. Award-winning bots (from my earlier game NetSpades) are available to fill any empty seats. Common Spades rule variations are supported. The fact that flame shoots out of your head when it is your turn to play should be ignored, I was in a silly mood when I coded that bit.
This game is part of the Synthetic Reality "Arcadia" family of games. (http://www.synthetic-reality.com/arcadia.htm) Players add additional channels at will using the integrated MIX server. Arcadia itself provides all networking support, in addition to text chat, voice chat, web browsing, and a parallel existence 'park' environment for serenity, duck-feeding, and paintball while you wait for other players to show up. Arcadia allows you to create a personal identity with which to expose your current emotional state, and maintain a diary of other players you have met in the game.