I personally like to run the bass, kick, and lead vocals up the middle and spread the toms and cymbals as if I were watching the drummer on stage.
I've read several psycho-acoustic studies that say that the left brain (right ear) tends to process more rhythmic sounds better and the right brain (left ear) does better with melodic stuff. It's a pretty heated debate, but with that in mind, I like to put the rhythm guitar further right and even the snare slighty right (1:00).
I try to keep the solo's slightly left (10:30 - 11:00).
...just another opinion
Justin