Introductory Guide to Critical Theory

Just want to register a fine link here for anyone wanting to get their head around the rather expansive subject of Critical Theory. I began reading 'The Differend: Phrases in Dispute' by Jean-Francois Lyotard (1983) this morning and one of the first things that struck me was the elegance of it. However it can be rather intense at times and that's why something like THIS is great.