Caught this link from an article on Wired. A dev called Kevin Roast created a version of Asteroids while learning how to use HTML5. Worth a look - has weapon upgrades! http://www.kevs3d.co.uk/dev/asteroids/ Post your high scores - mine = 545,800 ... I didn't try very hard but will come back to beat other scores High score now: 1,818,400
Would like to see the power-ups resemble the weapon upgrade in some way, but apart from that a real good game! It even has traditional old-style Asteroids mode.
Excellent implementation of the game and a worthy demo of what can be accomplished on this next evolution of the web.