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.
- http://tomshardware.co.uk/2004/03/10/future_promise_for_graphics/index.html

PCI Express Design: A Lesson In Techno-Shock
- Explains in detail the challenges associated with implementation of PCI Express bus. Also looks at the rewards of going through with the implementation.
- http://www.elecdesign.com/Articles/Index.cfm?ArticleID=10174

PCI Express Compliance Testing
- Gives an overview of the requirements for PCI Express Compliance testing.
- http://www.eurekatech.com/products/pci/pcie_compliance.htm

PCI Express Bus Description
- A very concise description of PCI Express Bus and its architecture.
- http://www.interfacebus.com/Design_Connector_PCI_Express.html

PCMCIA: ExpressCard
- Standard for higher speed PCMCIA form factor cards that supports USB2 and PCI Express. Includes FAQ and technical information.
- http://www.expresscard.org/web/site/

ASIC Architect
- Design and manufacture of PCI Express and DDR I/II controller IP cores. Based in Santa Clara, California.
- http://www.asic-architectinc.com

Wikipedia
- Article outlining the components of the protocol and competing formats.
- http://en.wikipedia.org/wiki/PCI-Express

Neoseeker.com
- Article including a technology overview, comparison with older buses and considerations of its future prospects.
- http://www.neoseeker.com/Articles/Hardware/Features/pciexpresstech/

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.
- http://developer.intel.com/technology/pciexpress/devnet/

PCI-SIG
- Standards development group. Offers details of technology specifications, document review and compliance testing, test software and checklists and press releases.
- http://www.pcisig.com/specifications/pciexpress/

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.
- http://arstechnica.com/paedia/p/pci-express/pcie-1.html