This script will download all the session material for you if you are a WWDC 2013 attendee OR NOT! This year you only need to have an Apple Developer account, that's it! You can now simply install WWDC-Downloader as a ruby gem like this:
gem install wwdcdownloader --no-rdoc --no-ri
or
sudo gem install wwdcdownloader --no-rdoc --no-ri
Run the script like this:
wwdcdownloader <your Apple ID> [<target-dir>]
The script will create a directory called "wwdc2013-assets" (or if given) in the directory you run the script from.
That's it. Enjoy and see you next year.