This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Warning: Here follows unsolicited advice on faults:
However, since you already know under what circumstances you want to return a fault, returning a custom fault, which also is declared in the WSDL, would be a courtesy to clients having only a WSDL to refer to. I would want to compare it to throwing a Throwable exception when a method receives an illegal parameter, when a IllegalArgumentException would be more informative to clients.