Another resource that I forgot to mention are the 25 lectures by Peter
Friedlander of La Trobe University. They are online at:

http://www.latrobe.edu.au/asianstudies/Buddha/lectures.htm

Prof. Friedlander manages to make interesting what some might find to be a
rather dull subject. For this reason he is worth reading by any Buddhist
who feels he really ought to know something about the history of Buddhism,
but doesn't happen to like history very much.

Best wishes,

Robert