My picture editor of choice, Pixelmator, has updated to version 1.2 (as with many other applications, it's just in time for the Apple Design Awards deadline), which they're calling Draftsman. Among the new features are the much-awaited addition of rules and some guides to the UI (with a flashy little indicator as the mouse passes by), as well as the ability to edit color balance and the color curves. There's also a new Polygonal Lasso, and the Transform tool has been reworked "from scratch" to work faster and better.
Pixelmator continues to impress, and with every update, it's becoming a more and more robust little photo editor. Just recently, they laid out "a flight plan" on the blog for what they're up to for summer: the next release, 1.3, will be called Tempo, and focus on making the app just as fast as it is visually striking. And they make another bold claim as well: by the end of the summer, they're aiming to be "completely bug-free." Good luck with that.
But there's no question that development is rolling along for Pixelmator. The app is available as a free trial over on their site, or a full version for $59. If you're looking for an alternative to the 'Shop, Pixelmator is a great way to go.