What are your favorite games from the indie gaming scene? (Bonus points if they're free!) Here's mine:

QuadNet (http://www.brainchilddesign.com/Bottom.php?Page=Games&SubPage=Quadnet) - A fast-paced, addictive shooter where you control a green triangle on a board that tilts as you move - the corner's aren't as safe as you think they are!
Plasma Pong (http://www.plasmapong.com/) - Pong taken to the next level, where you can shoot plasma to push the ball to the other side without it ever touching your paddle.
flOw (http://www.jenovachen.com/flowingames/flowing.htm) - Interactive natural selection; eat everything smaller than you to get bigger and explore deeper into the depths of the ocean.
StepMania (http://www.stepmania.com/) - A free DDR clone for PC, complete with the ability for users to add their own songs and step sequences!
Freespace Open (http://www.hard-light.net/) - The open-source space flight/fight sim, with a good single-player campaign and opportunity for many mods!
Peggle (http://www.popcap.com/games/peggle) - Addictive, colorful game that's kind of like upside-down pinball.

Plasma Pong (http://www.plasmapong.com/) - Pong taken to the next level, where you can shoot plasma to push the ball to the other side without it ever touching your paddle.
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Like hell. Even if you hate Pong (and you're going to hell for that), you should check this out - the special effects are awesomer than Crysis'.

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I'll mention Ragdoll Matrix Reloaded (http://www.acid-play.com/download/ragdoll-matrix-reloaded/) here, which is a fun, albeit somewhat pointless. It's more fun with another player, actually.

Orbiter (http://orbit.medphys.ucl.ac.uk/) A Space Shuttle Sim

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Like hell. Even if you hate Pong (and you're going to hell for that), you should check this out - the special effects are awesomer than Crysis'.

Aww, seems the site has been taken down :(

I caught Crayon Physics (http://www.kloonigames.com/blog/games/crayon/) on Digg yesterday, and it is one spectacular game. Its similar to Armadillo Run (http://www.armadillorun.com), which is another spectacular physics-based game (which is actually worth its price!).

Aww, seems the site has been taken down :(
Damn. :( I say you look for a torrent or a mirror or something. It's a freeware game, so no guilt or law-breaking here. ;)

That's a bummer about Plasma Pong; maybe they should have called it Plasma Ping or something to avoid the trademark stuff....

Armadillo Run reminds me of The Incredible Machine (http://www.the-underdogs.info/game.php?name=Incredible+Machine+3.0%2C+The).