Describes ATX power connector pinout and wire colors.
http://www.saunalahti.fi/elepal/vahvistin/atx-liitin.html
AT power supply connector pinout and information
http://www.epanorama.net/documents/pc/pcpsu_connector.html
from car +12V power
http://utter.chaos.org.uk/~altman/mp3mobile/#Techie
There are many parts in old computer power supplies that are useful in electronics projects.
http://www.shlrc.mq.edu.au/~robinson/Information/computer_psu.html
200 Watt modern computer ATX Power Supply for either 230V or 115V operation.
http://www.saunalahti.fi/elepal/vahvistin/Atx_power.gif
http://www.algonet.se/~ncc1701d/bin/psu.zip