Wow missed your post there some how Impact... lucky though, because I just found a really cool TD game.
And yes, I was thinking after Chamber is done I might look at a TD game of some sort. Raze is always an option, but it was more of a practice thing/tech demo/etc.
If anyone else finds some TD games that are worth a mention, post 'em up... I'm always looking for things to do late at night when my brain stops working well enough to create something or play a serious game, but still retains enough basic motor functions to build towers.