Even though they don't teach me anything new I quite enjoy watching these short animated introductions to philosophers narrated by Alain de Botton.

If, after watching this video, you'd like to read more about or by Michel Foucault, the best introduction to Foucault is the Very Short Introduction by Gary Gutting published by Oxford University Press. If you'd like to read something by Michel Foucault himself I would recommend Discipline and Punish as a first book.

By the way, the photos of Michel Foucault's bald head have become so iconic that it almost comes as a surprise to find that he once had hair.

The short introductions to Wittgenstein and Derrida are also very good.