Google has made its day one keynote from Google I/O available to watch via YouTube. While there was skydiving involved in both day one and day two's keynotes, it was this one where Google really grabbed people's attention.
This goes beyond just the extreme stunts, however. This is the full two-hour presentation, where Google announced things like Jellybean, the Nexus 7, and the Nexus Q (among other things).
This keynote will go down in history as one of the coolest, most elaborate presentations in tech keynotes, mostly due to the presentation itself. Google is going to have a hard time topping this one next year. Perhaps something with driverless cars could do that trick.
If you just want to watch the stunt part, go here.