One of my favorite Mac graphic apps, Pixelmator. Think of it as Photoshop Lite, and priced at a mere $29. From Bambi Brannan on Mac360 on Photoshop:
To get the most out of it, you’ll need to fork over the full price, use it for a few years, maybe take a few classes, or buy training aids to figure out all that Photoshop can do.
You’ll spend 1/20th the price of Photoshop, and end up with an app that has a gentler learning curve, a similar set of tools and capabilities, and is ready for Mac OS X Lion’s built-in Versions and Autosave to make your image editing life a little easier.
What’s it look like? Photoshop.