I don't mean to keep plugging this site but they've got so many good indie game links.
Tetripong is Tetris mixed in with a reflecting Pong ball. Sometimes you love it, sometimes you hate it.
The game has another nice feature that resembles Genetos in that it starts with the most basic graphical version of Tetris and as you level up, it upgrades the graphics.
Another great download, and really a unique twist on Tetris.