Last Updated: February 9, 2014
Legio XV
German recreationists dedicated to the Roman period.
Levantia
All you ever wanted to know about Asia Minor in Byzantine times but weren't aware that you wanted to know about it...Seriously, this is a phenomenally useful site for historical research into a fascinating place and time that just screams out for RPG/fiction adaptation.
Library of Congress
Yep. What more needs to be said? Very handy site.
Libri Vox
Free public domain audio books. Cool.
Literary Gothic
...will disappear in June 2014, so if you want to see if it might be useful, go before then. Shame to see it go...
Lin Carter
Author Profile at Old School Heretic (Coming Soon)
At Wikipedia
Low-Tech Magazine
A tremendously useful place to get ideas about what people actually can do with minimal technology...
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Honorable Mention:
(Young) Lin Carter blog
It doesn't get updated much, but when it does, it should be interesting, especially since the author is hard at work on a biography of Lin Carter.