My favorite philosopher, by a wide margin, is David Hume. (Never mind the epistemology stuff, not sure what he was doing there, forget that).
Very nice article in NYT on Hume, and why he gets disrespected.
In fact, it seems to me that Ron Paul is the modern political version of David Hume. Everyone says that he's right about a lot of things, perhaps wrong about some things, but in any case they certainly can't take him seriously, because.... hard to say why, actually.
As Bertrand Russell put it: "Rousseau was mad but influential; Hume was sane but had no followers."