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 Galleries
Black and white images of pages with drawings of herbal plants in the Manuscript.
http://www.geocities.com/Athens/Delphi/8389/voygal1.htm
Letters to God's Eye
John Stojko's claim that the manuscript is written in vowel-less Ukrainian.
http://home.att.net/~oko/voynich/voynich.htm
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/
History of Voynich Manuscript
An illustrated overview of discovery and attempts to translate.
http://www.crystalinks.com/voynich.html
Wikipedia: Voynich Manuscript
Article discussing the manuscript, its history and theories of its authorship, content and language.
http://en.wikipedia.org/wiki/Voynich_Manuscript
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
