Fare alerts: know when prices drop across all airlines

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One of the older travel sites around ( but extremely useful when finding cheap airfare. Either alerts are pushed via email, you can browse on site or what's hunted above - their new iPhone app.
Founded by an old friend, @georgehobica, he is the life force behind it. Extraordinarily well known throughout industry as an experienced travel writer and blogger.
I was going to say "kinda like Farecast" (one of the coolest travel-related things from 10 years ago) but it looks like Microsoft / Bing Travel killed it back in April of this year. Sad. Glad to know there are quality alternatives.
I have tried this but I get more spam from them than useful stuff.