Sharon Steuer’s free “Zen Of The Pen” PDF is an excellent introduction to the inner mysteries of the vector pen tool in Adobe Illustrator.
Update: Sharon has kindly asked me to remove the link to that PDF, she’s working on an updated version. I highly suggested you head over to her website and sign up for updates. Sharon is the mastermind behind the excellent Illustrator WOW! vector tutorial books for Adobe Illustrator.
The pen tool is one of those obscure graphics programs tools that everyone tries once, and then gets so confused by that they never get any further with it. And understandably. It looks like a fountain pen, but it doesn’t act like one. Click and “draw”, you get weird “handles” sprouting out from a dot. Ignore that, and some annoying rubber band line gets stuck to your pen tip, all distorted out of — not even a straight line! Right there most Illustrator users think to themselves “this program sucks”.
But they couldn’t be further from the truth…