Suse hardware database
Redhat hardware database
Mandrake hardware database, Hardware Book, general hardware book, circuits, connectors ..., Linux USB hardware
Linux USB device DB, Linux printer database, Linux on Laptops, long list with different Laptop types, Linux on Laptops and other mobile devices, Linux Laptops pre-installed [Deutsch], The Embedded Linux Portal, Hardware and Linux site [Portuguese]

Connectors and pinout
Tommy's pinout collection, General computer hardware info
Internet Hardware Book

Other hardware pages, self made hardware for your linux computer