Which Website has the best fare watcher?

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I'm looking for a "fare watcher" facility that'll e-mail me if a fare drops below a specified level on a specified city pair for a particular airline or airlines.

Best one I've found so far is Travelocity's, but that one has a limit of five city pairs and, more importantly, can't be limited to specific airlines (i.e. my frequent-flyer ones).

Anyone found anything better?
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I agree Travelocity's is better than Expedia's but I've given up expecting anything useful from either. Travelocity's seems to be always a day too late for me. All depends on what you're looking for. If it is being notified 24-48 hours after a new lower fare is posted, I guess it works for that. I think it fits into EPS's post on how the internet information tools are crippled to give an edge to those who pay for timely service.
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I agree that neither is all that useful. I use Travelocity's more often in terms of actually looking at it and then jumping to the site but I don't trust it all that often.
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I like Qixo (www.Qixo.com) for fare watch. However, it does not allow for multiple stops.
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