Super Duper Games
Super Duper Games offers online play of over 100 games with very solid implementations.
A typical SDG interfaceScreenshot from SDG
It claims to still be in beta, but both game implementations and online play is very solid. A highly recommended site, and one that Chessicals aspires to resemble more as it grows up!
Amazons
Burn the board together!By Walter Zamkauskas.
Aries
Push your way to the opponent's corner.By Chris Huntoon.
Bombardment
Bomb your way to victory!By Chris Huntoon.
Breakthrough
Break through the enemy defences.By Dan Troyka.
Euclid
The game of deadly geometry.By Chris Huntoon.
Jostle
Jostle for ever-better positions!By Mark Steere.
Mad Bishops
Mutually assured destruction.By Mark Steere.
Razzle Dazzle
Dazzle the crowd with a razzling goal!By Donald Green.