Yes, without a doubt, I feel the pen tool is a must know feature which can open up a whole new world in using Photoshop. I most highly recommend reading the gurunetwork tutorial that Dreamer101 posted above "The Pen Tool". It is by far one of the best I have ever read concerning this aspect of Photoshop. In fact it is the same link I was going to post here until I saw that Dreamer had beaten me to it. Practice, practice, practice!