The official Back to the Future website
www.bttf.com
Back to the Future fanfic on FanFiction.Net
http://www.fanfiction.net/movie/Back_to_the_Future
The LiveJournal BTTF fan fiction community
http://community.livejournal.com/backtothefanfic/
The LiveJournal BTTF slash fan fiction community
http://community.livejournal.com/bttf_slash/
Back to the Future Fan Creations discussion forum
http://s7.invisionfree.com/back_to_the_future/index.php?s=6d86cb708df6e1cd45edfd184084b9ef&showforum=14
Sixty Seconds to Eternity: A Marty/George Archive
http://www.drworm.net/bttf/
The World May Never Know - An essay by DrWorm on Marty/George slash
http://community.livejournal.com/ship_manifesto/31313.html
Other sites I run:
Whoa is (Not) Me: Defending Keanu, Deciphering Reeves
http://www.whoaisnotme.net
Quintology: Zachary Quinto Fandom Portal
http://www.quintology.net