Dallen, I don't see why a beginner should use a belt, I'd rather say a beginner shouldn't so he will get some basic core development before he starts using it later (if he does).
Also, belts aren't suppose to compensate for bad form, they give extra support and reduce the chanse of having a hernia (bit unsure there, comfirm, anyone?), however, if you use a belt all the time in the gym, your core won't be as developed and you will increase the chanse of a hernia when doign something like lifting boxes IRL. Therefor, I'd say if you lfit alot of boxes, you shouldn't wear a belt, because you need to train your core for the strain of every day activity.
If you are looking to compete, most competitions allow belts (if not all, I'm not sure) so then lift with a belt when the weight gets heavy, as you will need to learn how to get the most of your equipment.
If you are lifting just to lift heavy and being cool, I'd say it's up to you.
If you do decide to go with the belt, I wouldn't use it for lifts less than 90% of 1RM, but that's my opinion.
However, I do believe the real answer might be "who cares?" - aslong as you don't use it for everything and become one of those "belt guys" it's really not that big of a deal..