Hey pops, zerglings are so 1998.

You can still do a 4-pool rush: http://www.youtube.com/watch?v=9rTCRg9_7Hw

Silly Noob, it's a six pool now.

Also, really a seven pool because it makes sense to make a drone instead of saving for the spawning.

The ideal rush is an eight pool, unless you wish to do some sort of timing attack.

Really, there's an article on the front page about timing lessons. If you can't time an attack in an RTS, judging by what the competitor has and when you should release your force, how can you expect to release a product in a much more complicated situation?