If you use a Mac and regularly need to resize batches of photos, there’s actually a tool built into your operating system that lets you do just that without having to open any image editing program. It’s called “sips”, which stands for scriptable image processing system. It’s extremely easy to use, but you’ll need to know how to use Terminal to take advantage of it.
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Here’s something that might give you a chuckle (or be too painfully accurate for some of you): Visual Idiot created a web-based Adobe Photoshop simulator that attempts to faithfully reproduce how the program works in Mac OS X.

Adobe® Photoshop® Simulator [Visual Idiot]