Searching Sound
Technology Review has one of their few stories that's not registration-required describing searching audio files for any specified set of sounds. All sorts of interesting applications become possible if you can turn analog audio into a digitally-useful product without massive human intervention.
Like, for example, the technology to search all phone calls for the words "president" and "bomb" in the same sentence? I mean, come on, why don't they share...
Hang on a second, who's that at the door?