Heh, I've run into problems like that all the time. To be honest, there's not much you can do with them physically. How bad is the bleed through? If it isn't too bad, you should be able to edit it with a photo manipulating program (e.g. Photoshop, Gimp, etc. heck, even Paint works, though I wouldn't use that one XD) by clearing out all the black w/ white (make sure you scan it in with Black and White mode if there's no color.). Now, if there's color, your best bet is to go over it with the other color. But at that point, I'd admit defeat and trace the paper.
It's not that bad, really. It looks like a faint shadow in the background, and yes, it is in black and white (I know for a fact that if it was color I'd be royally screwed). I've got Photoshop, so could you just list the steps to take in order to not make it look as bad as it appears (I haven't used photoshop before, so I'm new at it).