Also note that since the errata wasn't incorporated into the
SRD before
4e. The errata isn't "technically" part of the
OGL. I really wish they had done the
SRD for
3e & 3.5e like they did for
4e and it being an actual reference to the book.
Also note that any third party books that you use you HAVE to include all of their Sec. 15 listings (unless you can figure out what they used from each book, good luck with that

). Of course if some books are listed more than once you only have to list it once.