First one is Big Buck Bunny, a short ( around 10 minutes ) open-source movie created by the Blender team.
http://www.bigbuckbunny.org/index.php/download/
( you can order a DVD containing all of the original source 3D files and textures etc – so that you could re-render the entire movie yourself if you so wished – as well as lots of extras, tutorials etc. To do to, visit http://peach.blender.org/ and click on the relevant button )
The second one is pretty funny too ( am not sure what 3D app was used )
http://www.spiegel.de/video/video-30120.html
Hope you enjoy!
Mal