AutoClips records a history of the items you have cut and copied to the Mac Pasteboard, You can get back older items organised chronologically, or by application, or by Spaces workspace. Get them back either with a hotkey popup window, or from a status bar menu. You can also create your own permanent lists of commonly used clips.
AutoClips is part of the Automaton suite of products. You can also buy Automaton which includes AutoClips with three other indispensable tools.