kartme posted a good post about changes they made with usability testing. they mentioned uservoice which is on turk if I remember, they mentioned doing a followup post explaining more about what the did during testing.
I think something our field may benefit from is a guide that explains how to use the different usability services and at what point in the project cycle they should be used.
Another hack to is to do testing in student centers (as opposed to bars) so you can get people on their own computers.