Neal, R. M. (2001) ``Transferring prior information between models using imaginary data'', Technical Report No. 0108, Dept. of Statistics, University of Toronto, 29 pages: abstract, postscript, pdf.The functions are written in R, version 1.1.1. They will probably work in S-Plus too, but I don't recommend trying it, for performance reasons.
First (and probably only) release of 17 July 2001: tar archive.