Device Drivers Toolbox
some installer packages with drivers for multiple devices...
chipset (motherboard)
drivers for everything that might be incorporated on the specific chipset: bus mastering, USB, AGP graphics, audio, etcetera
VIA
Hyperion 4 in 1 Driver: http://www.viaarena.com/?PageID=2
ethernet: http://www.viaarena.com/?PageID=71#lan
video graphics display: http://www.viaarena.com/?PageID=70
and on that web site are various other drivers for more obscure hardware, and fixes for various situations
Intel (http://support.intel.com/support/chipsets/)
Application Accelerator: http://support.intel.com/support/chipsets/iaa/
Chipset Software Installation Utility: http://support.intel.com/support/chipsets/inf/
video graphics display: http://support.intel.com/support/graphics/
audio (directions): http://www.intel.com/support/chipsets/audiodriver.htm
USB 2.0 (directions): http://www.intel.com/support/chipsets/usbdriver.htm
ALi (http://www.ali.com.tw/eng/support/support_driver.htm)
Integrated driver
SiS (http://www.sis.com/support/driver/utility.htm)
modem
Connexant / Rockwell
generic drivers for all/most Connexant / Rockwell chipset based modems [Windows]: http://www.conexant.com/support/md_driverassistance.html
generic drivers for all/most Connexant / Rockwell chipset based modems [Linux]: http://www.mbsi.ca/cnxtlindrv/
generic drivers for all/most Lucent / Agere chipset based modems
http://www.agere.com/support/client/modem_driver2.html
ethernet network card
network cards will usually have a utility available for updating their IRQ, memory address, transceiver type etcetera
most/all RealTek network cards
http://www.realtek.com.tw/downloads/downloads.aspx
3Com (UK and Ireland): http://www.3com.co.uk/
Broadcom BCM57xx and BCM4401: http://www.broadcom.com/drivers/downloaddrivers.php
sound card
Kx WDM audio drivers and mixer for all EMU10K1 and EMU10K2-based sound cards manufactured by Creative Technology Ltd.
and/or E-mu Sytems Inc. (including SoundBlaster Live! series, E-mu Audio Production Studio (APS) card, Audigy series)
Windows: http://kxproject.spb.ru/index.php?skip=1
Creative
Windows, Europe: http://uk.europe.creative.com/support/drivers/
video graphics display
ATI
various 'made by ATI' and 'powered by ATI' drivers, including the Catalyst suite (for Radeon series cards): http://mirror.ati.com/support/driver.html
(the standard Catalyst package now supports all languages)various 'powered by ATI' drivers: http://mirror.ati.com/support/drivers/powered.html
Matrox
various drivers, BIOS and utilities [Windows;Linux]: http://www.matrox.com/mga/support/drivers/
unified driver collections (possibly not as up-to-date as the individual drivers) [Windows;Linux]: http://www.matrox.com/mga/support/drivers/unified/
individual drivers [Windows;Linux]: http://www.matrox.com/mga/support/drivers/latest/
NVIDIA
individual drivers [Windows;Linux;FreeBSD]: http://www.nvidia.com/content/drivers/drivers.asp
'Detonator' unified driver collection for most NVIDIA video cards [Windows] (possibly not as up-to-date as the individual drivers): http://www.nvidia.com/view.asp?IO=feature_detonator
miscellaneous useful stuff
every product has an FCC ID code, use the FCC search page to help identify it: http://www.fcc.gov/oet/fccid/