John Green's website
http://http://johngreenbooks.com/
The author's website which includes additional information on Looking for Alaska and his other books as well as interview questions and his biography.
John Green's VideoBlog
https://www.youtube.com/vlogbrothers
John Green and his brother agreed to only communicate with each other for an entire year by posting videos to Youtube. This is their Youtube channel that contains their year-long exchanges and newer content.