The movie "Perpetual Ocean", created from simulations carried out as part of the MIT/NASA-JPL ECCO2 collaboration as visualized by the NASA Goddard Scientific Visualization Studio - which has been going a little viral over the past few days - shows ocean surface currents around the world during the period from June 2005 through December 2007. The animation does not include a narration or annotations; the goal of its creators was to use ocean flow data to create a simple, visceral experience.

MITgcm ( the MIT General Circulation Model ) is a numerical model developed by MIT ocean modelers (and free for anyone to download and play with) that finds wide use within the oceanographic modeling community worldwide. 

Read more at MITgcm News