The titles now available are 'Dinosaurs Alive' and 'Wild Ocean,' both of which were originally created for IMAX theaters, and the latter of which has seen more favorable reviews.  It's a nice bonus for subscribers, since the free On Demand equates to a free viewing of a Blu-ray that's coming out in just a month's time.

If you want to check out 'Dinosaurs Alive' or 'Wild Ocean,' simply bring up the On Demand menu, scroll on over to Free Movies and then pick 3D.  From there you've got a list of titles which include the two new films.