Apple’s WWDC developer videos have lots of great resources, but the information in them isn’t easily findable unless (a) you’re logged in to the developer site, and the code in the video is posted somewhere as a sample, or (b) you watched the video recently and vaguely remember what year it was from, which video it was, and where in the video you heard about it.
This method by Carl Brown is great for creating a faux index of WWDC developer video content, right on your Mac:
I keep all the slides for WWDC 2010, 2011 and 2012 in subdirectories of a folder named “WWDC slides” in my Documents directory. It’s indexed by Spotlight on my Mac.
From then on, when I’m working on a project, and I’m having trouble with something, or trying to remember something I might have seen, I open up that folder in Finder, and type the Class or Method names of the Classes I’m working with, and Spotlight will tell me the session names of the videos I might want to watch.