http://www.dual-boxing.com/showthread.php?t=26247
http://www.dual-boxing.com/showthread.php?t=25380
http://www.dual-boxing.com/showthread.php?t=25564

http://www.dual-boxing.com/search.php

Enter "making gold", click search now.

The common ways:

Play the AH
Farm mats for professions and sell
Farm Dailies