Why can’t you buy a heterodyne/parametric array desktop audio system?
This isn’t for your music—this is just for daily communication. Just think of how awesome it will be for video bloggers to be able NOT wear headphones and look like doofuses on Skype. This seems like a massive, untapped market for http://www.holosonics.com.
Bring back payphones with this technology and you’ll never have to touch an unsanitized handset ever again or worry about a missing handset.
I mean, really, kiosk “areas” for advertising your bananas in supermarkets is a really, asinine application of this technology. The only place I’ve ever seen this in the appropriate wild was a public library in Ogden, UT at a public-information station. But add a microphone to the mix and you’ve gotten away from mere pico-broadcasting and made something better.