A few years ago, the the Federal Judicial Center (FJC) created a video providing an introduction to patent law for judges and juries. The video is available here (Windows Media, Quick Time), and provides a very good (although general) introduction to patents and the patent office. I would recommend that anyone coming to work in a patent firm should watch this video as part of new employee orientation.
A sample patent used in the video is available here.
The video is used by some judges as a replacement for the testimony of a "patent law expert."