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General:
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Zembla (probably the largest VN site)
Random House's VN site (with bio and chronology)
A biography of VN (from Zembla)
A chronology of his life from the same site
A list of works (from Zembla)
Index of criticism (from Zembla)
VN Collations (from Zembla)
The Nabokov-L homepage and archives
New York Public Library's Nabokov exhibit (very cool!)
Nabokov page at CNN
Wellesley College Russian Department VN page
A photo exhibit of VN from Ardis Books
VN's drawings of butterflies
VN essay on butterflies from Atlantic Monthly
Brian Boyd's introduction to _Speak Memory_
Apparently all or most of VN's work online (mostly in Russian)
From the above site, the interviews are in English
An essay on VN and Alfred Hitchcock
Extensive collection of VN links
Another VN site

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Pale Fire
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Critical works online for Pale Fire (from Zembla)
A Pale Fire bibliography (from Zembla)
Pale Fire cover art
Another cover
Brief discussion of the first verse of "Pale Fire" (applying BoLa)
NY Observer article
A hypertext version of Pale Fire (in Russian)
Lengthy interview with Brian Boyd concerning his 1999 Pale Fire book
Hypertext theory essay including a section on Pale Fire
Pale Fire discussion questions
Essay on word golf
Pale Fire Wikipedia
VN reading from Pale Fire (in RealPlayer format): 1,  2