The first "Animatrix" short is now up at The official Animatrix site. I'd suggest doing a "view source" on the page with the "Large" version, as although it's huge and therefore best downloaded instead of streamed, it's both well produced and well encoded.
And, yes, it's very, very good. It can be criticized as somewhat derivative of Asimov, but I have little doubt that were Asimov alive to see it, he would have loved the Matrix.
I eagerly await the other shorts.