FileBrowse for Mac

From R Green Blue:

FileBrowse is a unique file/media browser for Mac OS X with many interesting features, such as:

• Thumbnails for most common file types, such as images, movies, songs, PDF/RTF/Word documents, and even web pages. Even on Tiger. Finding a file by visual content has never been easier.
• Beautiful 3D icons/thumbnails, rendered in real-time using OpenGL, with lifelike, soft shadows and perfect anti-aliasing (no jagged edges).
• Folder icons that show miniature icons/thumbnails of the items inside, so you don't always have to open a folder to see its contents.
• Large previews for most common file types, shown in-context (between the icons). This is much faster than having to open a file in a separate application.
• Powerful grouping and sorting, by kind, date, color label, artist, album, camera, and many other attributes. Groups can be easily "collapsed"/stacked and in many cases can replace folders.

FileBrowse looks beautiful, is very easy to use and can seriously improve productivity. Version 1.0 costs just $25 and is available as a fully-functional 30-day trial download. It's a Universal (PowerPC/Intel) application.