My wife suggested I start using IrfanView, a PC tool for image manipulation (resizing and cropping photos, etc) and so far I really like it. It has a tool for viewing thumbnails of the images in a directory that makes it really easy to find photos. (I took hundreds of photos during the steam tests, for example.)

I tend to take my pictures at the highest resolution my camera offers (6000 x 4000) and downsize them to 600x400 for posting. I'm sure it has hundreds of options I'll never need.

Her biggest complaint is that it is for PCs only, no Mac version.