Gus Mueller of VoodooPad fame has just released a new image editor, Acorn.
Acorn is a new image editor built with one goal in mind - simplicity. Fast, easy, and fluid, Acorn provides the options you’ll need without any overhead.
Given Gus’ prior software samplings I bought Acorn without even trying it. 
Knowing Gus I’m sure it will live up to his expectations.