PCI Specifications - PCI-SIG specifications, descriptions, related ECNs, correlating white papers and documents, and associated compliance checklists. - http://www.pcisig.com/specifications
What's New With PCI - Download the invitation of the latest workshops available. - http://www.pcisig.com/events/compliance_workshop
A PCI Links Page - Primarily intended as an engineering resource for people who need to deal with computers built around the PCI bus. - http://www.mitsi.com/Link/books/pci.htm
The PCI Special Interest Group - Unincorporated association of members of the microcomputer industry set up to for the purpose of monitoring and enhancing the development of the Peripheral Component Interconnect (PCI) architecture. - http://www.pcisig.com/