This script will download all the session material for you if you are a WWDC 2011 attendee.
You'll need ruby and the mechanize, highline and json ruby gems. You can install them like this:
sudo gem install mechanize json highline
You simply run the script like this:
ruby wwdc11downloader.rb <your Apple ID> [<target-dir>]
The script will create a directory called "wwdc2011-assets" (or <target-dir> if given) in the directory you run the script from.
That's it. Enjoy and see you next year.