This looks really good and really fast.

“World Construction Kit is is a toolset / framework for rapidly developing physics based games / websites within the Flash IDE. WCK allows you to layout your 2d worlds / game levels entirely within Flash and have them hook into the physics simulation without writing any code. Documentation located on the GitHub wiki page..”
Sideroller is a nice game in development using it, the whole game is on a wheel.

Nice little game, the coloured + symbols remove different parts of the levels, gravity is reversed and there are spikes and more.
Play now!

http://www.addictinggames.com/color-of-theory-game.html
Hakim El Hattab has created some nice demos, all very interactive
http://hakim.se/experiments/


http://www.redditmedia.com/ads/reddit-fun-2
It reminds me of Jezzball on the PC, I spent days playing that game as a kid.


“3D Tron Lightcycle game that runs in (almost) any browser, without any plug-in!”
didnt work in FF 3.6.6 but did work in chrome 4 for me
http://www.jangaron.net/jangaron0.5/jangaron.html
“The game is completely written in Jangaroo, besides one ActionScript class that allows access to the Flash Sound object from Jangaroo. As all Jangaroo applications, it runs in all major browsers.”
“Jangaroo is a set of tools to run ActionScript 3 code in JavaScript 1.x environments, especially in current web browsers.”
It sounds good but I havent looked into it yet

Windosill is a really cute game by Vectorpark
play the game here