I was doing a search for a PID controller enclosure, and ran across the website for Auber Instruments (http://www.auberins.com). They make a plug and play sous vide controller that will directly operate up to an 1800W heated vessel, such as a rice cooker or a crock pot. This is a great alternative for someone who has a rice cooker and sitting around, and it's worth $139.50 to not have to cobble up something to control it. The controller can be found here. Nice, clean design! I like it!
They also make a variety of other controllers suitable for sous vide cooking, as well as other applications. They sell sensors, solid state relays and PID controllers for those who want to build their own system as well.