is a new file browser for Mac OS X. It replaces the file size and date columns with different size dots. Larger dots positioned more to the right in the window represent larger files sizes with a newer date. It makes it really easy to scan a window and select files in that window visually.
It also has an extremely quick file search/filter in the window that is in many cases much easier to use than Apple's slower Spotlight search. It grabs results by the file information and displays it in a tree structure that is flat and easy to scan.