XnView (v1.96/1.70) is an efficient multimedia viewer, browser and converter.

XnView (v1.96/1.70) is an efficient multimedia viewer, browser and converter.

Come to discover XnView, a software to view and convert graphic files, really simple to use ! Support of more than 400 graphics formats ! It's free, so do not hesitate !

http://www.xnview.com/en/download.html

This is one of my favorite image viewer's which has a clean
interface and ability to view video as well,
plan vanilla - play/pause button.

Has simple easy to use editing as well for those who want a camera-to-web ready tool.

A nice add-on is the explorer shell extension:
XnView shell extension (v2.60) is an extension for windows explorer.
You can right click on any image to get a thumbnail size preview.