Recommended links

Biblical Studies
The New Testament Gateway
Biblica – Free and prestigious online Journal.
Perseus Project – Many Greek and Latin texts with translation and parsing tools (including the New Testament, the Vulgate, and Josephus), as well as an online version of Liddell and Scott.
NT POD – A Series of New Testament lectures on podcast

Science
Project Tuva – 7 interactive lectures by Richard Feynman
Nasa Science
Darwin Online – The complete works of Charles Darwin online.

General
Marxists.org – I am not a marxist but how can you not promote a site with so many important historical documents.  Basically every important writing by everyone who ever had leftist leanings for free (including the complete works of Marx, Engels, Eugene Debs etc..)