Great General Masonic Links
The Grand Lodge of British Columbia and Yukon Ancient Free and Accepted Masons website contains information on philosophy, symbolism and history, textfiles, and many other resources about Freemasonry.
When it has not been vandalized, Wikipedia's Article on Freemasonry is very good.
Pietre-Stones Review of Freemasonry - a wealth of Masonic Articles.
University of Sheffield Centre of Research into Freemasonry and Fraternalism
Link The official site went down, but read this on Wikipedia
The University of Bradford's "Web of Hiram"- an electronic database of old masonic material held in the University's archives, and submitted. Mostly old lectures and rituals.
Phoenixmasonry Masonic Museum and Library is probably the best masonic virtual museum
Phoenixmasonry also has a great masonic glossary