Bruce Morleland has some excellent stuff on his Computer Chess page, including some details on transposition tables that seems useful.
Today was a miserable day for my checkers program. I suspected that some of the cases that were causing me some difficulty in the puzzles that I have attempted to date were caused by some problems with my alphabeta search. To resolve this, I coded up some simpler versions and a simple version of minimax. Indeed, I found that these worked reasonably well, but that my transposition table code bolluxed things. I obviously didn't have the brain cells firing on all cylinders, so here it is, 12:35AM and I'm scanning the web for papers that might help. I found that Zobrist's original paper on transposition tables was available for download.
Here it is: Tech Report TR88
I didn't realize that the data for The Internet Movie Database (IMDb) was available for download as plain text files. Did you?
Thanks to the Foxmath blog for pointing this out to me.