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AnandTech
Article covering history of the bus market and an explanation of how the specification works.
Ars Technica
Technical overview explaining basic PC system architecture, an explanation of how PCI and PCI-X work, and an outline of the benefits of PCIe, and PCIe to PCI bridging.
Intel.com
Developer network for PCI Express architecture. Offers overview of the specification, introductory videos, details of books for developers, press releases and how to join the network.
Neoseeker.com
Article including a technology overview, comparison with older buses and considerations of its future prospects.
PCI-SIG
Standards development group. Offers details of technology specifications, document review and compliance testing, test software and checklists and press releases.
Tom's Hardware Guide
Article discussing the impact of PCI Express on the graphics and gaming market, its relative performance compared to AGP, and the responses of the two main graphic cards manufacturers to its introduction.
Wikipedia
Article outlining the components of the protocol and competing formats.