Now that underground movies are now both outdoors and viral, Rooftop Films has their own section on IFC.com dedicated to the short films they have/are/will present in their yearly spectacles.  There's a selection of over 100 films to be had at the Rooftop/IFC fork, and it is a great way to see some of the greatness being exhumed at the Rooftop shows.  They add three new films each week, so the rotation is fresh and different with each go-around.  The films range from regular human to experimental to animation, so you'll definitely get some variety with your meal.  If you are reading this post today and decide to check out the site, might I suggest Pumpkin Hell, A Film About Violence, The Morning Sun, and Princess.  The featured one, Polvo, is pretty good too.

Also available at said fork, the Rooftop Shorts blog.  Pretty insightful it can be, yes.