FilePane is a lightweight, versatile multi-tool for quick file management. It provides quick access to a variety of tasks like resizing of images, setting the Desktop picture, showing file size, copying a file's path to the clipboard, converting text documents to PDF, moving and sharing files, images, and text via AirDrop, Twitter/Facebook, etc. By default, FilePane is triggered on drag-and-drop, but you can change this to a hotkey in preferences.
How it works:
FilePane is not bound to Finder only, but works with other apps like Safari, mail clients, and text editors.