Criterionco-224x74I'm a few months late with this, but the purveyors of the finest DVDs and Blu-rays in the land (with the finest special features) -- the Criterion Collection -- have made many of their films available to watch online for $5. Films are available from auteurs like Fellini, the Maysles brothers, Les Blank, and more. The $5 charge goes towards the price of the full disc, should you decide after watching a film online that it belongs on your bookshelf.

Link: The Criterion Collection Online