TripStalker -- a bot utility that continually looks for your best price and notifies you when it finds it.
Lifehacker thread of comments on this topic.
Another link collection on cheap ticket gimics.
Lots of people mentioned Sidestep (I use occasionally) and kayak.com, and travelocity doesn't fare too badly in the listings.
Priceline.com is worth a try as well. They allow you to bid for how much you're willing to pay for your airline tickets, with the stipulation that if you win, you're obliged to pay.
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