For Installing or developing Drivers.
Installing Drivers
Linux Device Drivers Demystified tutorial @ LinuxPlanet
list of drivers
Linux-kernel mailing list FAQ - see section 2 on device drivers
www.linhardware.com
Linux support for some Winmodems
PCMCIA
USB (includes driver development)
Developing Drivers Tutorial for Newbies
(none, yet)
There are some links in the section below, but they are outdated on certain parts (especially regarding code). They might not be suitable if you are new to the topic.
Developing Drivers
Linux Loadable Kernel Module HOWTO (as 1 large html file) (updated 2006)
Linux Kernel Module Programming Guide(updated 2001)
Linux Device Drivers 2rd for 2.4.x (whole book online) (updated 2001)
Linux Device Drivers 3rd for 2.6.x (whole book online) (updated 2005)
Misc Character Drivers(updated 1998)
I/O port programming mini-HOWTO(updated 2000)
Advanced Topics
Porting device drivers to the 2.5 kernel(updated 2004)
Reference: WritingPortableDrivers(updated 2017)
Reference: User Level Drivers
MindShare, Inc has a nice series of books on various bus protocols, including PCI, USB, PCMCIA and Cardbus (from http://www.handhelds.org/pipermail/ipaq/2000-November/002223.html).
KernelCodeRepository : users kernel code