If you live in the world of professional design, graphics and video, at some you’re going to tangle with Photoshop.  There aren’t too many videos that I produce that don’t utilize photoshop on some level, and definitely for most graphic stuff.  I came across this list of some pretty incredible movie posters that were all edited and created using photoshop.  I think my favorite is Lord of War simply because of all the detail and time it probably took to create it.  Check them out here.