I first read about Desktop Tower Defense on TechCrunch and have resisted checking it out … until now.

I think the best way to describe the game is as a sort of “reverse-Lemmings” game. Instead of helping an army of assorted lemmings overcome obstacles to reach the other side of the maze, you set up a maze and weapons to stop an army of “creeps” from reaching the other side of the maze. The appeal is the same – you get to “program” the weapons and obstacles in a certain way to stop the creeps.