Inking Digital Artwork?

[GrooveMan.exe]

I'm asking this on a friend's behalf, but I'm pretty interested myself.

In the process from sketch on paper to finish digital art; what processes do you go through, and which programs do you use? Are there any cheats and tricks to it? Or methods that you use to get a unique style out of your inking?

I believe he's also interested in colouring methods, so if anyone has information on that, you get a bonus gold star.

Thanks in advance!