What exactly is gained/lost from going prestige in Black Ops? I've heard that you keep the different layers, but not the various camo and attachments.
The rewards for prestige are as follows:
Apparently you lose everything except for emblems.
I can confirm that you don't lose absolutely everything when prestiging.
Some of the things I've noted you don't lose:
The important thing to me that IS lost is pro perks. You have to start from scratch and complete the challenges all over again(along with actually buying the pro perk). I consider this a design flaw, but it's the way it works.