There is now a large collection of Jataka tales at Sacred Texts Archive: The Jataka, Volume I trans. by R. Chalmers, edited by E.B. Cowell - with more volumes to come!
Jataka tales: Part I | Part II | Part III (Buddhist Publication Society). Often the jataka tales are retold for children in English translations, but these translations try to convey the devotional and religious character of the stories.
There is an excellent collection of jataka stories, with illustrations, at the Indira Gandhi National Center for the Arts website.
More Jataka Tales by Ellen C. Babbitt (1922). In contrast, this is a set of jataka tale translations intended for children.
MLLL-2003. World Literature: Frametales. Laura Gibbs, Ph.D.
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