I have always believed that if Apple designed a Photoshop competitor, it would be something like Pixelmator: clean, powerful, and intuitive. While Photoshop will set you back hundreds of dollars, Pixelmator can normally be purchased for only $30 in the Mac App Store.
Not only is price a huge factor, but Pixelmator is also updated more aggressively than Photoshop. For example, Pixelmator looks great on the new MacBook Pro’s amazing Retina display, but Adobe still hasn’t Retina-ized most of its Creative Suite.
The folks who make Pixelmator have announced a special holiday discount. For a limited time, the image editor is being sold for 50% off!