http://en.tldp.org/FAQ/Linux-FAQ/index.html
http://www.scyld.com/network
http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux
http://tuxmobile.org/
http://www.linuxdevices.com/
http://www.linux-usb.org/
http://www.linux1394.org/
http://www.linuxprinting.org/
http://www.sane-project.org/
http://www.alsa-project.org/
http://www.4front-tech.com/linux.htmlOSS/
http://www.xfree86.org/
http://www.xouvert.org/
http://kerneltrap.org/
http://www.whacked.net/ldl/faq/
http://lists.debian.org/debian-laptop/
http://www.linmodems.org/
http://www.hardwareguys.com
This is the companion site to the book PC Hardware in a Nutshell. It's not Linux-oriented, but it's a great resource all the same.