Extrasolar Planet: Has water
Planet HD209458b's atmosphere contains water, along with oxygen.
However, don't go getting your hopes up, this planet is in a tight orbit, and is quite litterally boiling away. Well, actually, tidle forces are stripping away the expanded atmosphere, [Its been heated to about 10,000° celsius] with the solar wind probablly contributing.
Its orbit is only 4.4 million miles [7 million kilometers] out from the sun, even closer than mercury.
It's also a gas giant. [about 1.3 times larger than jupiter, not taking into acount its vastly expanded atmosphere]
Finally, its orbit is only 3.5 days long, this thing is whipping around its sun at a phenomenal speed.