Hacked Gadgets pointed out this great peltier based beverage cooler. It has a pulse width modulation based controller driving a 12V 80W peltier. Alan also pointed out Hack-A-Day reader Chris Garrison’s peltier beer cooler from last summer. The Defcon cooling contest from last year also featured a peltier based cooler.
[UPDATE: Afrotech's Snapple Cooler or How to enhance your beverage with iron oxide. Thanks liam]