Version 3.3 of the popular Mac image editor Acorn is out, and developer Gus Mueller writes up the biggest changes on his blog. The Retina Canvas is likely the coolest update: If you're using Acorn, you can now see any art you create at a 1:1 ratio on a Retina Display. So if you have a MacBook Pro with Retina Display and Acorn, you can now see your own work perfectly clearly. All of the other elements have been updated for the new display as well.
The update also includes the option to trim a certain selection out of a picture, redo a selection if you lose it for any reason, and the Smart Export feature as well (which will automatically save layers in a piece separately for later use in code).
Acorn 3.3 is a sandboxed, App Store-only version (which makes sense, given that Apple is cracking the whip on that lately). But Mueller also says that if you'd rather run the version downloadable straight from the website, it'll know whether you've run the App Store version before, so you still have your choice. Sounds like a nice solid update to a great app.