Pixelmator is an easy-to-use, fast and powerful image editing program that has everything you need to enhance, edit and retouch your photos. Pixelmator's powerful toolset includes selection, painting, color correction and retouching tools that easily … see full wiki
I was looking for a basic image editor: nothing fancy, just something that would redo and touch up pictures.
Wow! Pixelator was everything I could've wished for, and way more. It's easy to learn the basics on it, but you can also "get fancy" if your needs or desire are so inclined. It's an excellent tool for a newbie, but it also has room to satisfy someone with a bit more expertise.
I'd highly recommend it for a non-expert like me who wants something that works without needing an advanced degree. But photo mavens won't be disappointed, either.