This will make a nice thread to show how nice XnView can be. A small explanation can go along...

I start...

My main use is for Photography. With the large square thumbnails, I can easily find an image and all Vertical/Horizontal photos have the same size (thanks to ch3n3 for the idea...

I also optimized things quite a bit: 20 images per page for visual estimation, maximized image area (oh please: remove that minibar), no need for preview, long expanded tree for quick browsing, dark neutral grey to focus on images while allowing to detect white/black areas, etc...
Olivier
PS: please don't post directly the large image here -> use an embedded thumbnailed version as I have done or just the link.