Pyro Sand Game
This is yet another version of the famed and highly addictive falling sand game which is believed to be of Japanese origin. The game appears on several websites throughout the net in multiple variations such as the Hell of Sand Game. This version was developed in late May of 2006.
http://fallingsandgame.com/sand/pyro.html

Hell of Sand Game (small)
Here is the Falling Sand Game, the highly addictive online game, puzzle, or what ever you'd like to call it game where you control flow of sand, water, salt, and oil by drawing walls, plants, sprouts and cera (wax)
http://fallingsandgame.com/sand/hell1.html

Maverick Checkers
Maverick Checkers is the one of the best checkers games that can be played directly through your browser. This checkers program comes with several engines that are strong enough to challenge even good players.
http://www.okoware.com/products/games/maverickcheckers/demo.