I guess I'll start it off by saying that my favorite place to kiss someone is the neck, since its so soft and usually you can feel their warm breath on your neck while you're kissing theirs, which is absolutely awesome.
now this sorta depends on whether i am having sex or cuddling in bed. i like to kiss zoomie's back as we are drifting off to sleep, right between his shoulder blades. but other times, it might depend on what position we are in, like if he's above me and comes down to kiss, shoulders or the neck are good.