Zoner Photo Studio FREE enables you to organize, edit, and resize your photos. It’s easy to learn and use—and it’s (you guessed it) free:
NOTE: I've been using it myself for several months now, and love the crop, clone, and resize tools that are part of the Edit panel. Slide shows are also impressive, yet easy to set up. You can also purchase (very reasonably priced) upgrades of Zoner Photo Studio if you need more advanced photo-editing capabilities.