Here are some links with good information for referees:
This great Fouls and Misconduct Chart describes Soccer Fouls & Misconduct.
Link to Current Documents of Interest.
The Watch and the Whistle. This link does a great job of describing the referee game day experience.
US Soccer Referee Resources. Look at the Videos and Downloads tabs especially.
FIFA Refereeing Materials.
Montana Soccer Referee Association.
Montana SDI YouTube Videos.