Enter the Animatrix: DVD out today, so I'm all caught up on these. All sorts of interesting stuff in there - backstory (both distant and recent) and just adding more depth to the world. Also looked at the comics on the main Matrix website over the weekend which another way of expanding the universe. Wah! Need Revolutions now!
Fast cars: Got pointed the other day in the direction of this neat website. Yes it's all a gratuitous promotion for BMW's cars - but with style. It's a series of short films - mostly car-chasey - with big name directors and stars. Haven't had the chance to watch all of them yet, but my fave thus far is the season 1 'Star' - featuring Madonna getting thrown around the back of (and then out of) the car, plus neat Blues Brothers reference. Be warned: Large downloads.