How do you amp your system?

Curious as to the various ways people here are amplifying their various speakers. Assuming 5.1 or 7.1 in most theaters, with a .1 amplified on it's own, is there a prevailing wisdom?

Front 3 amped the same, lower standards for surrounds?

Each channel amped the same?

One amp handling all speakers, or duties divided between multiple (presumably lower power) amps?

I know better than to ask 'what's best' since there is no 'best', but I'm curious as to the various viewpoints...