Aluminum sucks if you ask me.
Similar thing happened to me last summer with my Cannondale R1000. A mystery snapping noise developed into a cracked bottom bracket shell. Took me over a year to get them to warranty it but finally I am getting a new R1000 frame. And yeah, I'm going to sell it.
Anyway, sorry to hear about your Trek. At least not all is lost. You'll still be able to sell it and you won't have to fight tooth and nail for a year for your warranty. Btw...you might want to check your helmet for cracks if you really threw it across the lawn!
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