Dr. Michael Delahoyde
Washington State University
The Complete Works of Shakespeare
Just what it says.
The Shakespeare Quartos Archive
Especially Hamlet right now....
The Oregon Shakespeare Festival
The Shakespeare Festival at Ashland, Oregon is a blast!
The Shakespeare Fellowship
In addition to myriad other resources, this organization's site features discussion boards to which I'm occasionally addicted.
Brief Chronicles: An Interdisciplinary Journal of Authorship Studies
A truly Oxfordian, no-sell-out, new journal.
The Shakespeare Oxford Society
The Society's site offers lots of resources pertaining to the authorship issue.
Shakespeare Authorship Studies
Dr. Daniel Wright of Concordia University summarizes the case for the 17th Earl of Oxford and heads the annual Shakespeare Authorship Studies Conference (formerly the Edward de Vere Studies Conference). I've attended and spoken annually since 2002.
Edward de Vere
A resource on the Earl.
The Shakespeare Authorship Sourcebook
A library of resources useful to Oxfordian studies.
The Shakespeare Authorship Coalition
A recent initiative to get this thing settled once and for all.