Saw this today, looks interesting.
"Bosco’s Foto Trimmer (“Foto Trimmer” for short) scales, stretches, squishes, rotates, flips, and trims digital images. It adjusts the brightness, contrast, and color level of your image. With its Fixed Size feature, Foto Trimmer can automatically scale and trim images to common sizes, such as banner ads, greetings cards, or a standard size you use for photographs on a web page."
30 day demo, Mac or Windows
http://www.componentx.com/FotoTrimmer/
$25 if you like it.