Another great blog on drawing, by Rob Adams.
I don’t know how to reblog his post,
so I will give you a bit and send you on to enjoy the post:

Textures with Pen and Ink

I said I would do this a while ago. So here it is, my take on pen and ink. Pen was really the first medium I seriously worked at. Oh there had been scribbles in pencil and daubs in the vile paint they make school children use but it was the first medium I seriously set about learning. At first I used Rotring pens. I had them from doing mechanical drawing for A levels. It seemed natural to carry on and sketch with them. There is not a lot to recommend them you have to hold them square to the surface, they give an unvarying line and block at the drop of a hat. However since I had never drawn with any other sort of pen I thought they were great. I still have a full set in a special box. My next discovery was dip pens made by Gillott compare to Rotrings they were wonderfully variable in line thickness and quality, this came at a cost of difficulty of use and the nasty habit of dropping a big blob of ink on your almost finished masterpiece! Lately after a foray into using fibre pens, (the same problems as with Rotrings) I have settled on using fountain pens with flexible nibs. They don’t quite offer the variety of line that the dip pens do but are far more convenient to carry about and sketch with.

Continue on for LOTS of images and more of the tutorial!