I have been using Leap and Yep (the PDF Organizer) for awhile now and continue to get more comfortable with them. The 1.0b6 ver changes the user interface (the Selection and Source columns on the left and the "Search Definition Bar" above these columns) to be much more user friendly than the previous versions. You will get much more out of Leap if you embrace the concept of tagging (keywords) your documents. If you take this step, Leap will leverage Spotlight to become a highly efficient way to locate just the files you need to find, right now. Once they are found, QuickLook technology makes it easy to check what you have found.

It is a little less structured and a different means of managing files as compared to the Finder but is a beautifully envisioned Mac application