Recent search on iTunes listed the Madison Area Technical College classes on iPhone development by Dr. Brad Larson
Session on OpenGL ES 2.0 recommended by Gurus. Go and download the complete sessions from here
Download Apple WWDC Keynote videos
I was always disappointed with Apple Keynote pages. It allows you to stream and watch the videos with QuickTime which is not great for streaming and videos are not HTML5 yet. Another restriction with QuickTime is, you need to have QuickTime Pro to save the video.
Obj-C | For beginners
A quick obj-c cheat-sheet for the beginners.
This is taken from RWTH-iPhone Application Programming. You can also download complete videos from iTunesU.