There's an excellent article by Scott Taves at seattlepi.com about cold-brewed coffee. An admitted hot java "purist", Taves became a cold-brew nut last month when he tasted Caribou Coffee's chilly offering in Chicago.
Setting his sights on making the stuff at home, he bought the Toddy Cold Brew System and has all sorts of good things say for the $38 machine. It also serves a second master, brewing tea as well.
More interesting to me though is the $85 Coffee Snob Cold Drip Coffee Maker. A fascinating contraption that stands 2 feet tall, it begs for a Victorian parlor to call home.