for proof that it works and other ways to help out (if you're not quite ready to rock a pixie cut), click here and here.
I'm going to post again soon with some recent photos of my self and my three concealed (soon to be revealed!) dreads, but for now I just wanted to send this along.
ETA: damn, as a few of the commenters have pointed out, BP is apparently refusing to accept the hair booms and people are being asked to stop sending donations. I'm disappointed, of course, but I guess your best bet is to donate detergent or other needed materials instead of your hair trimmings.