Freelance Programming Sites?

CarrotLord asks: "I have some small, fairly well-defined programming projects that I need done, but I don't have time to do them myself. So, I've been looking into sites like Get a Freelancer and ScriptLance. Does anybody have any experience of these types of sites? Specifically, I'd like to hear your recommendations and advice, as well as your experiences. My concerns include: getting very poor quality work; communication and language barriers and also losing control over the work that I've paid for -- if I'm paying for some work, I want it licensed on my own terms."