I think that the case for libertarianism is becoming a bit more well respected in the philosophic community, although it is still a minority view. Certain major tenants of libertarianism are widely accepted (philosophical anarchism comes to mind) even if the position on the whole is rejected. The philosopher mentioned in this article (Michael Huemer), wrote a great book called The Problem of Political Authority which lays out a very good argument against the state in the first half and attempts to defend anarcho-capitalism in the second half.

While I don't think the second half of the book really succeeds in what it's trying to do, the arguments are well laid out and it's a good read regardless.