http://en.wikipedia.org/wiki/Printed_circuit_board
http://tech.groups.yahoo.com/group/Homebrew_PCBs/
http://tech.groups.yahoo.com/group/Inkjet_PCB_Construction/
http://techref.massmind.org/techref/pcb/etch/directinkjetresist.htm
http://www.qsl.net/k/k5lxp/projects/PCBFab/PCBFab.html