[gte910h]

There is not a way to do this on the device (on iOS, while not jailbroken)

[stucksimon]

Actually, I think it was mentioned that they have a method where they look at your other apps that are currently open. They make a decision based on how often you have those applications open when it is polling. It seems like a pretty good method if possible.

[gte910h]

All you see then is process names. You can't see real CPU time, etc.

You can do heuristics, etc, but you have a huge mapping problem of programs to actual apps