I can't say someone is the best of all time, because I have never seen footage of every single boxer, and like numerous people mentioned in this thread a lot of great boxers were held down in Sugar Ray's time because they weren't "connected". But that aside, out of all the guys I've seen I can't think of anyone better than SRR. I'm a big fan of his (you can see the tribute video I made of him on Youtube, its the one with the song "Devil or Angel" at the end). Unbelievable offensive fighter. Manny Steward said it best, he started out his career at 135, and when he moved up in weight he was knocking out tough middleweight's with one punch. Such a great fighter.