I don't know if anyone else would find this sort of thing useful, but I've been using my l33t (OK, not really) HTML skills to turn the game's XML files into something easy to scan.
So far I've finished the Defense-related ship parts:
http://miscfile.alienharmony.com/galciv2/ship-defenses.htm
Note: The techs with question marks are where the tech requirements in the ship parts file didn't match up with any exact tech tree file techs... however, they did seem to me like they would match up with various alignment-related techs. No idea what "Telepathic Defenses" gives you, though.
Feel free to do with this file whatever you like. I'll post more tables when I'm finished with them, if people would like that.
Peace & Luv, Liz