Search function fail, Steve. We'll forgive it this one time.
Most of us are big believers in the belt's ability to make the lifter stronger than lifting without using the belt. And most of us are advocates of the Best Belt Athlete 4" for most normal-sized people, at least for squats, while some may need a narrower belt for the deadlift.
www.bestbelts.net
There are other very nice belts out there. Bob's Belts, for instance. One poster around here seems to prefer them, but you'll find nothing but glowing reviews of the Best Belt, and the price is a bit friendlier.