Oh, you're talking about the linart
I use everyday graphic pen and draw it on paper
Mini-tutorial:
1) Draw the sketch
2) Scan and make the sketch a lighter color with Photoshop
3) Print the lighter (I used cyan) sketch out
4) Ink it
5) Scan it again and remove the cyan lines
By the way, do you know a freeware like Adobe Streamline? When the art is zoomed in, I can see that the lines are all jagged... :\