Can anyone point me to specific links regarding the Tome classes/feats/etc? I want to read up on it more, and show it to my DM.
Well, there is a
pdf that has a lot of it, but there is even more that hasn't made it into there yet. Of course, Frank and K started the "Tomes", so links to the original Races of War, Tome of Necromancy, and Tome of Fiends are probably the best place to start reading up on them. Then the pdf, forums, and links in that wiki are good places to keep digging if you want more.
The
new wiki page seems to be down for some reason... but here is a link to the
old one which still has most of the stuff. It is just no longer being updated. Just poke around in the Homebrew section. Not everything in there is "Tome", but the handbooks section has links to the ones I mentioned above, as well as the newer (and incomplete) Tome of Gears, and the Tome of Elements (which was a community project, not a Frank and K work).