Tears of Steel is a crowd-funded short from the Blender Institute in Amsterdam, and was made using Blender, an open source 3D content creation suite. It's also pretty awesome.
The 12-minute film is chock-full of effects, and for the most part they're pretty good. Some of the effects can look a little silly at points, but the whole film has a bit of an absurdist bent to it, so it kind of fits. Plot-wise, it revolves around a guy who has to make up with the robot girlfriend he pissed off years back. I'll leave it at that, but the concept is pretty novel, and executed well. So give it a watch, and be nice to your Roomba. [Project Mango Blog via The Verge]