PropEdit, a new free app by eosgarden, aims at making the process of editing file and folder permissions on your Mac super-easy. Instead of relying on contextual menus in the Finder or the Terminal to modify owner and group permissions, PropEdit offers a graphical user interface inspired by the Finder's column view that allows you easily find your way through the system and act on files that need a permission fix.
PropEdit features an additional sidebar that contains all the options you might need to change permissions; instead of chmod in the command line, you can simply check off items to modify a file's ownership, and so forth. It's all very simple and strightforward.
Terminal junkies will of course stick to their insane command line skills when it comes to permission editing, but PropEdit is really good. It's not available in the Mac App Store, but you can download it for free here.