Image Viewers

Besides ACDSee and Infranview, what's a good FREE image viewer? I've been trying out Faststone and it's got some nice features. Things I found bothersome though include shrinking images to fit the screen by default (can't change it, or I can't figure it out anyway), can't change the pane positioning, and can't open straight from a rar.

Some other image viewers I've seen but not tried are PicWalker and P3d0 Explorer (official 4chan pic viewer?). They claim zip/rar support.

Ok, discuss.

Irfanview and Faststone are the best I've found, and I've looked around quite a bit. Not a fan of ACDSee, as it's pretty bloated.