Open Source Help-Desk Software?

ASyndicate asks: "I am starting a consulting business. I am looking for a good Open Source program that implements a web-based help-desk system. What kinds of projects and programs would the Slashdot community recommend? What I need is a set of pages that will allow a client to check the status of his/her work order on the machine(s). The only projects I found were ones on sourceforge that did not have any files released. Only one did and It was no where near operational." There was a similar question back in 1999, and there were a small number of informative responses to the query. Has the intervening time improved the options at all?