Pixelmator 2.1 has received a major update with a number of improvements including support for the newly released OS X Mountain Lion.  Pixelmator is a great alternative to Photoshop on the Mac and has gained quite a following since being introduced.  

New in 2.1:

• Retina-Ready
• iCloud support
• New Effects Browser
• Alignment Guides
• OS X Mountain Lion Support
• and more.

Pixelmator is usually $59, but at the time of this writing they are having a sale for just $14.99.  This is a great value and I highly recommend this app.  The update is free for current users, and others can purchase via the Mac App Store.