How-To: Use the Pen Tool

Aahhh. The dreaded pen tool...

At first, a bit puzzling and unintuitive — how the hell does this work? And then, with a little practice it becomes second nature.

But which pen tool?

The one in Photoshop, Illustrator, Quark etc? They all have their different quirks.

Here's some for Photoshop which I found in about 30 secs with Google.
• Basic Pen
• Paths & the Pen Tool
• Pen Tool Tutorial