Picked this up today (the 2-disc set with CD, naturally) and *LOVED* it. I'd already seen 5 of the shorts and liked all of them (Flight of the Osiris was a favorite, with Second Renaissance a close second and Detective Story a pretty close third... and if you ask me tomorrow, I might rearrange the order of those, and put Program in the mix as well). The last four on the disc are also anywhere from good to exceptional. Matriculated got a little too weird for me, but is still intriguing, but the rest are fantastic. I particularly loved the fast-paced "A Kid's Story," although the lyrical and strange "Beyond" and the hopeful and powerful story "World Record" are also great.
This has had the side-effect of interesting me more in some anime, and I've put Blue Submarine on my Netflix list as a result... the last thing in the world I need is a new addiction, but these features, and the well-done documentary about anime that accompanies them, has stirred my interest a little more. I also got a kick out of seeing local professor, Dr. Susan Napier, on the documentary, given that she's a professor that a friend of mine talks about constantly and absolutely adores.
I liked Matrix Reloaded, but in just about every way, The Animatrix is the superior product. I can see myself watching it over and over again, in whole and in part.