History of Voynich Manuscript
   An illustrated overview of discovery and attempts to translate.
   http://www.crystalinks.com/voynich.html

NASA's Astronomy Picture of the Day - The Mysterious Voynich Manuscript
   Image and discussion of one drawing in the book that appears to deal with astronomy.
   http://antwrp.gsfc.nasa.gov/apod/ap050122.html

Scientific American: The Mystery of the Voynich Manuscript
   New analysis by Gordon Rugg of a famously cryptic medieval document suggests that it contains nothing but gibberish.
   http://www.sciam.com/article.cfm?chanID=sa006&articleID=0000E3AA-70E1-10CF-AD1983414B7F0000

Stolfi's Voynich Stuff
   Includes extensive studies by the author including grammar paradigms and word frequency scatter-plots.
   http://www.dcc.unicamp.br/~stolfi/voynich/

The Voynich Manuscript
   Museum of Hoaxes article on the Voynich Manuscripts.
   http://www.museumofhoaxes.com/voynich.html

Voynich Manuscript
   Mailing list, introductory information, links to related sites.
   http://www.voynich.net/

Wikipedia: Voynich Manuscript
   Article discussing the manuscript, its history and theories of its authorship, content and language.
   http://en.wikipedia.org/wiki/Voynich_Manuscript