LilyView is a lightweight, mutli-touch-friendly image viewer that's handy and doesn't get in your way.

LilyView Features

• Lightweight: There's no image library to load, you just browse images in a folder.
• Chromeless: No controls are visible until they are really necessary.
• Multi-touch friendly: You can literally touch the image when using a trackpad, but LilyView works just fine with keyboard and mouse.