Inking has always been my favorite step of completing a drawing, which is one of the reasons I held out on digital tablets for so long.
Although I'm still looking for new techniques, I've so far just treated the brush tool in Photoshop as an inking pen, clarifying and focusing the sketch layer into well-defined figures. Although I do miss the ink-on-paper look and feel, using layers to build a composition and the eraser tool to reclaim the white negative space takes away all the pressure of leaving an errant, permanent mark somewhere on the page. I'm sure that there's something to be said for shunning that sense of perfectionism, but I can't imagine trying to render all that rubble in the foreground without the ability to make serious revisions.
The only huge downside I've discovered for this digital technique is the inability to use a ruler to make straight lines. Maybe that problem would be easily solved if I started working in Illustrator over Photoshop...
(inking over the transparent sketch-layer from my previous post)