Prepairing Line Art in Photoshop

Tutorial. Did it this afternoon, in a fit of boardom.<br />
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I've gotten the question before, regarding line art, of "WTF?! why do you do it this way? Just change the layer properties to multiply!" My reply to that is that you NEVER want to change the properties of the layers containing the base part of something. What that means is that you DON'T want layers with line art and base colors to be anything other than normal. If you have layers like that, changing layer properties later becomes a hassle.<br />
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Maybe I'll do a tutorial to show what each layer property does.