This a tutorial for artists on how to get nice , clean lines using the pentool in photoshop. I used CS5, but this works in any version as long as it has the pentool. This is the simplest, fastest way I've found to get awesome lines on any kind of picture, be it a photo or drawing.
It looks pretty difficult but with a couple good practice hours you can easily get the hang of this method. I've upgraded since then and now have a scanner and tablet, but sometimes I still use this technique in my work.