tutut125
Oh damn nm tuts right. I'm thinking of a different powder game.

The Exact timeline of Tpt's history

1. Falling Sand - http://fallingsandgame.com/sand/ - Many (un)official versions - Some online, others downloadable
2. Powder Toy - http://dan-ball.jp/en/javagame/dust/ - Not popular for a while
3. Powder Toy - www.powder.unaligned.org - First downloadable tpt - Based on Falling Sand
4. Unaligned crashes
5. Binaries of powder.unaligned recovered and reopened to the public - http://www.geeks3d.com/20091109/download-the-powder-toy-physics-game/
6. New Tpt based on powder.unaligned - www.powdertoy.co.uk - current

This is the exact timeline of everything tpt. I started playing when there only was Falling Sand, before dan ball's version, which was quite a while ago. Read my other posts for more info. Hope this helps!

Also, everybody has been asking for a iphone/ipod touch tpt app: Falling Sand has 3 apps, 2 of them are free. Although, remember that it is based on the old falling sand game, so dont expect tons of features that tpt has.

Finalflash50
Thisissand was a very old game which was similar to falling sand. I didn't put it in my timeline because it never was an influence to tpt. It was one of the first physic simulation games, and it pioneered the physics simulator genre of games.