I've been experimenting with brush pens for the first time. A few years back I used to draw very precisely, over pencil lines that were later rubbed out. But in recent years I've drawn more loosely, on a piece of paper over a rough placed on a lightbox, but I carried on using the same technical drawing pens (Rotring or similar). They're good for precise work but the results are not always great with looser stuff. Anyway, brush pens were recommended to me by a couple of fellow cartoonists and I'm very happy with the results so far. They're more fun to use, though you do have to get used to drawing quite a lot bigger.
Thanks to Darren at the always excellent linkmachinego.com, for a very nice link today.