I usually go like 1-3 min between sets. maybe a little more once i'm a few sets into squats or deadlifting. I like to keep my weight training no longer than an hour but use everything i've got in my body in that time. followed up by a big high protein meal and your good to go.
you could check out
www.bodybuilding.com
theres pretty much anything you would want to know about working out.
those guys are pretty nuts tho on the forums