I loved it, and it got me thinking... what it would take to make a real MMO asteroids?
This is my attempt: http://mmoasteroids.wildbunny.co.uk/
The client is flash and the server is c#, although it used to be node.js.
Its very early and probably wont stand up to that many users, but its quite fun :)
Let me know what you think!
Cheers, Paul.