From the Adafruit Forums: Pinout Diagrams for the Arduino Uno and More.

My Arduino kit is en-route but I was perusing the Arduino Forums and found what looks like a very useful diagram that a person made and they are giving it away. You can see one of them below. The links to the PDF files are in the thread here - Link to diagrams

They look to be very useful diagrams.

Read more on the Adafruit Forums.