Finally! We have MARC records available for the Recorded Books One Click collection. On the vtaudiobooks blog, you can find the file in the Box.net widget in the left sidebar, in the folder "Recorded Books." You can also link directly to the file at http://www.box.net/shared/oulo9btm1z.
This is a large file, and contains a record for the more than 2,700 titles in the One Click collection as of March 2010.