Inspired by the other topic and the research I made on that game, I have decided to make a post where to post some references about the Saturn.
Maybe this collection can be useful to somebody and maybe inspire somebody to try to make some Saturn translations.

General hardware specs:
http://videogamereview.tripod.com/saturn/specs.html

Some more:
http://dextremes.com/sega/sat-spec.html

Some specs on the SADX sound format:
http://sadxforum.freeforums.org/sanik-s-notes-issue-2-saturn-format-t191.html

Specs of the FILM video format:
http://wiki.multimedia.cx/index.php?title=Sega_FILM#Sega_Saturn_CPK_File_Format

Specs of the PCS graphic files:
http://www.youtube.com/watch?v=VmQ64ZVRdn0

Generic BMP specs (i don't know if it's really used on the Saturn):
http://atlc.sourceforge.net/bmp.html

Finally at least for the moment, the Saturn images are Mode1/2352 and not Mode2/2352 like the PSx.

If somebody has more specs or interesting sites about Saturn hardware, software, hacking, translations, etc...
feel free to add them below.