XnView one of gr8 image browser and jpg editor.

For sorting and managing photographs I have found XnView as very good tool. It provides good image browser with checking histogram and exif data on the fly.

Its Jpg file enhancer is real easy and can do things I want very quickly.

I prefer XnView over Google Piccasa for it works in Linux and does not stay awake in background. Windows version also available. http://www.xnview.com/en/xnview/