"ImageOptim optimizes images — so they take up less disk space and load faster — by finding best compression parameters and by removing unnecessary comments and color profiles. It handles PNG, JPEG and GIF animations. ImageOptim combines various optimisation tools: AdvPNG from AdvanceCOMP, OptiPNG, PngCrush, JpegOptim, jpegtran from libjpeg, Gifsicle and optionally PNGOUT. It's excellent for publishing images on the web (easily shrinks images “Saved for Web” in Photoshop) and also useful for making Mac and iPhone applications smaller." Ooh, looks excellent.