I've seen too many black suits so far, and too many of them just didn't look very good. I'm not talking just the color, I'm talking the fit and make.
Guys, I realize not all of us can afford an Armani, but you can't expect something you picked up from Kohl's or JCPenny to look very good. You really need to get yourself into a Men's Wearhouse or some other store where they have tailors on hand and other people who know how a suit is supposed to fit. They will alter the suit and remove all the tags and make sure it fits well.
A suit is an investment, so try not to be cheap. you don't need to spend a fortune to look good, but a $99 suit will look just like that.
(and yes, I know the majority of us are very poor students so we can't afford much, but if you have to ask your parents or someone to help you out, it is worth it)
Oh, and this was not directed at any particular person I may have encountered on my interviews, so please don't take it personally!
Just my two cents worth.