off-topic: I have a perverse desire to put some microphones up, see if there's any birdsong recognition software out there, and tweet whenever a bird in range tweets :oP
That's not perverse, it's a great idea. Ornithologists rely on crowdsourcing to conduct bird population surveys and track changes in bird populations from year to year. Let the volunteer surveyors sign up for twitter feeds for nearby detection of less common birds to go and confirm.