App Developers Conference Video (Marakana)
If you're interested in mobile app development there are several good, current (10/2011) videos available at Marakana including some short ones discussing market trends and some longer ones discussing the technologies.
Fascinating parallel between the market development in the 80/90s with Windows becoming dominant because of the apps available on it vs. other platforms and the incredibly rapid rise of the mobile platform and apps. Of course everything happens so much faster now. The app space has risen in just the past 3 years....