PCI Vendor and Device Lists --http://www.pcidatabase.com/
This page is primarily intended as an engineering resource* for people who need to deal with computers built around the PCI bus. It's reason for being is that there is no other centralized database of PCI device IDs.
PCI-SIG --http://www.pcisig.com
The PCI-SIG provides a forum for its 800+ member companies, who develop PCI products based on the specifications that are advanced by the PCI-SIG.