If you're working without Flash, either out of hardware necessity (iPads, hot-running MacBooks) or computational fidelity, you'll dig Aviary's new HTML5-based editor. It's a suite that has most of what you need to fix up photos in a Flash-less browser.
Aviary's made their editor tool embed-friendly for any and all sites, but you can try it out and save your work at Aviary's site. You'll get resizing, cropping, light and colour tools, redeye reduction, the "old cheap camera" effects that all the kids are geeked up about, and a lot of other tools you might not expect to find in a non-Flash environment.
Aviary's HTML5 editor is free to use, and embed on your site, if you'd like.
Aviary Launches HTML5 Photo Editor! [Aviary Blog]