Airfare watcher?

Can anyone recommend a good airfare watcher? I'm looking for a free on-line engine that will notifiy me of any good airfare deals from San Diego to Maui and back.



Thanks.Airfare watcher?
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http://www.kayak.com/



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http://www.farecompare.com/



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http://www.travelocity.com/homepage?Serv鈥?/a>



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http://www.justfares.com/newjustfares/de鈥?/a>
OrbitzAirfare watcher?
if price is your priority try CheapAirfare.com, a couple years ago I obtained 2 tickets from the US to Great Britain round-trip for $489.00 (including taxes and the Sept. 11 tax) I don't know if they have a fare watcher but couldn't beat that price. I think it was the same price paid in 1971
try dings... offered by southwest... i dont know if it notifiys you but i know that you can find some pretty good deals