still exists they have some good level ajusting tutorials. Also other photoshop tricks.
Also, once you've done the levels ajust, you can turn the black into transparency by inverting the colors of your scan (so the background is black and the lines are white) and pasting it into a new channel, then ctrl (or is it alt)-clicking that channel in the list.
You will get a selection in the shape of your line drawing. Just use the fill tool on a new layer (not a new channel mind you), and your drawing shows up as a transparent layer as if you'd drawn it with the brush tool.
Also, hi Spaff.