It's now possible to get all of the WWDC 2013 sample code by running some terminal magic.
If you don't have Ruby installed, drop to terminal and execute the following:
sudo \curl -L https://get.rvm.io | bash -s stable --rails
After the installation finishes, run the following to install the WWDC Downloader script:
sudo gem install wwdcdownloader --no-rdoc --no-ri
Finally, run the following to download the code samples:
wwdcdownloader <your Apple ID> [<target-dir>]
More details and script source here: https://github.com/jfahrenkrug/WWDC-Downloader
The flotsam and jetsam of a techie mind...