I was asked by the Principal at one of the high schools that I work at to provide websites that contain usable and printable Graphic Organizers for the staff to use with their students. Here is the list of sites that I came up with.
First, a great starting point is Cybraryman's Website for Graphic Organizers. Many of the below are probably on his website once or twice.
Otherwise, I would suggest viewing the following sites for some graphic organizers to use in your classroom