Lecture #2 looked at some of the history of AI and some introductory material on intelligent agents.
Notes are available in two formats:
Together with the last part of Lecture #1, this lecture covers roughly the same material as Sections 1.2 and 1.3 of the first chapter in the textbook, and much of Chapter 2. You should read through this if you have the book.
An exellent view of the history of AI can be found in Machines Who Think - A Personal Inquiry into the History and Prospects of Artificial Intelligence by Pamela McCorduck.