Lspci
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lspci is a command to list your pci devices. It is safer to use than looking at /proc/pci, because /proc/pci may be moved without further notice.
Additional info may be discovered by using the -v option, which combines vendor information from /usr/share/pci.ids . The -t option displays the data in tree mode by bus, device and function.
$ lspci -v -t
-[00]-+-00.0 Intel Corp. 440FX - 82441FX PMC [Natoma]
+-03.0 Digital Equipment Corporation DECchip 21142/43
+-07.0 Intel Corp. 82371SB PIIX3 ISA [Natoma/Triton II]
+-07.1 Intel Corp. 82371SB PIIX3 IDE [Natoma/Triton II]
+-07.2 Intel Corp. 82371SB PIIX3 USB [Natoma/Triton II]
+-0b.0 Matrox Graphics, Inc. MGA 2164W [Millennium II]
\-14.0-[01]----09.0 3Com Corporation 3c900B-Combo Etherlink XL [Cyclone]
Note to Gentoo users, lspci is part of the pciutils ebuild available in portAge.
You may also want to try 'hwinfo --pci'.