I've been wondering what the most lazy way of colouring while preserving the lineart cleanly (without the annoying white pixels) with Photoshop is. This is my current theory:
1. Clean up the lineart: Scan it at high-res (200-300dpi), then mess with the brightness/contrast so that the lineart is as black as possible without losing detail, and the paper is white. It depends on your scanner's settings, but putting the contrast up +25 and brightness up +15 is a fine starting point.
2. Make a background layer below the lineart layer.
3. Set the lineart layer to 'multiply'. Use the magic wand on the lineart to select the area you want, then Select-->Expand by a couple pixels (depending on the thickness of your lines. Basically, you don't want the selection to go outside the lines, but anywhere inside is fine).
4. Select the background layer so you're editing that, and use the paintbucket tool to colour it. Assuming I understand Photoshop, it should colour under the lineart and look all pretty.
November. Meanwhile, Apple has released some damn nice MacBook Pros. I don't think I'll buy one until a 17" model is released. And I may even wait until the Mac tablet, should it come into existence.