[bawllz]

Woah! Super cool idea. So many ways you can take this to a new level. Also, if anyone is looking to contribute to some open source, this would be a great opportunity as there is lots of epic optimization problems in this algorithm to work on.

For example, whats the fastest data structure/algorithm to make searching for neighbours?

[postfuturist]

I'd guess some type of BSP tree. I agree, it looks fun to work on, see how massive of a simulation you could run in real time.