A Conversation for The Hitchhikers' Movie: An Interview with Garth Jennings and Nick Goldsmith
Stephen Moore as Marvin's voice
C Hawke Started conversation May 20, 2004
What I can't find out anywhere, even on Stephen Moore's own site is is he doing Marvin's voice again?
Wouldn't seem right somehow without, I can live with, in fact looking forward to new actors for all other parts, but Marvin's voice is, well sort, of a constant - of course the voice of the Book would have to have been the same if it wasn't for the sad death of Peter Jones 
CHawke
Stephen Moore as Marvin's voice
six7s Posted May 20, 2004
http://homepage.ntlworld.com/mjs2000/movie.htm
The Hitchhiker?s Guide movie FAQ
[...]
Who else is in the cast?
Many of the alien characters will be played by suit actors, puppets or CGI and so only voice actors are required, and in some cases these will not be cast until the film is in post-production. This also applies to the voice of Marvin and the narrator or ?Book?.
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Stephen Moore as Marvin's voice
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