EasyBatch

EasyBatch is a powerful photo batch app for Mac, which lets you resize, rotate, watermark, convert, and rename - all in one simple app.
EasyBatch takes full advantage of today's modern multi-core Macs, giving you some of the fastest photo batching you can get.

Its integrated toolset goes a step beyond other batch programs, with features such as color profile support, file renaming, and EXIF preservation (including GPS data). It can even move old images to the trash, if you ask it to!