See also:

VISCO - The visual index of science fiction cover art. Has gallery with hundreds of old SF magazine covers (many pulp titles).
Analog Cover Art - Archive of cover art from the SFF magazine Analog 1966-70.
Art for SF's Sake - Article where SF editor John Jarrold issues a plea of tolerance for creative art on science fiction and fantasy book jacket covers.
DM O'Keefe - Ebook cover illustrator.
Duncan Long - Gallery of SFF book cover illustrations from Duncan Long.
If Science Fiction: Cover Art - List of cover artists associated with the various issues of the classic SF magazine If.
Interzone Science Fiction: Cover Art - List of cover artists for the various issues of literary British SFF magazine Interzone.
Pierre Fortin Arts - Book cover artist for SFF.
Science Fiction Cover Art Poll - Online poll about what type of cover art is favoured in SFF, classic or modern.
Science Fiction Weekly Art Gallery - Science Fiction Weekly's gallery of past cover art.
SF Cover Explorer - Artwork created from pictures of 3500 covers of sf magazines.
The Slow Death of Science Fiction Art - Article on the poor quality of modern SFF cover art, compared with the classic pulp era covers.
Solar Voyager - Space art gallery.