I couldn't really watch it, unfortunately, but the general feeling I saw on Twitter was that this was a vast improvement from last year's WWDC.
Gizomodo has a nice round up of the features announced. HomeKit sounds VERY interesting... it'll be fun to watch vendors try/not try to take advantage of that. And integrating Shazaam directly into Siri is pretty cool - but are people really hearing music that they don't recognize when they are out?
Where did you get your digital copy from? The DVD, iTunes, Amazon, etc.? I know you can re-download things on the PSN/Xbox marketplace, and I'm pretty sure you can redownload things via Amazon once you've bought them.