Where can I find short overviews of Foucaults work on the net?
There is useful introductory material on John Protevi’s site. You can also read a short introduction to his work at the Theory@org site by David Gauntlett. In addition, you can also look through some of the links listed under summaries and writing about Foucault on this site. You can also try SparkNotes Study Guides which provides study notes for The Archaeology of Knowledge, Discipline and Punish, The History of Sexuality: An Introduction, Volume 1, Madness and Civilization. You can also look at some of the encyclopedia entries on the links page of this site.