I was searching for quite a while for a simple tool to browse my pictures. The requirement I had was that the tool should be capable of giving me an overview of all pictures in a folder including subfolders. I didn’t want to use a fancy tool like iPhoto that builds its own library. I sort my digital pictures by date taken with SortImagesGUI into folders. Sometimes I’m searching for a specific picture where I know in which month it was taken. But scanning over all subdirectories in a month is silly.
Funny enough MacOS X has this capability build in right into the Finder. You just search for image type files in a certain folder and get a handy grid of pictures. I’ve made a quick screencast on this one. It works the same way if you’re looking for other file types.