Here's a video of how to classify quadrilaterals from School Tube.

http://www.schooltube.com/video/ee2f64b4844b4ec78705/

Here's a quick quiz to see if you've been paying attentiono classifying quadralateral.

http://teams.lacoe.edu/documentation/classrooms/amy/geometry/6-8/activities/quad_quest/quad_quest.html