I briefly touched on a handful of Kenneth Anger's early works contained in a compilation disc for Movie Mezzanine. Anger is one of the more accessible avant-garde filmmakers, though it can be hard to tell from some of the dense, symbolic, sexual imagery contained herein. These are rapturous movies, confrontational while being flagrantly sensual in a way I've not seen elsewhere. Highly recommended.
Check out my piece at Movie Mezzanine.