When you say a lot of material happened after 2e, do you mean the switch to 2e or the switch to 3e? I've got a book about specialty priests, well not just about specialty priests, that is 2e.
Right now I'm going through my FR materials and trying to figure out which material is 1e and which is 2e. So far, only one book states explicitly that it's 2e, but I know some of the other ones must be just going by their (c) date.
I'll take a look through my Greyhawk books as well. If that's easier to figure out (which is 1e and which is 2e), we should go with that. Though, the only monster stuff I have that is specific to Greyhawk is from the Monstrous Compendium, which makes it 2e...arghhh.
Such a mess to figure out.