What an amazing and simple idea - view a history of the things you copied onto your clipboard.  How many times have you copied a password just to overwrite your clipbard with the username before you could paste.  Well now you have a tool that will keep a history of your clipboard actions so you can go back and use what you previously copied.

http://www.outertech.com/en/clipboard-manager

Make sure to review the configuration forhotkey and history limit options!