Via fredhouse, another neologism: placecasting:

'placecasting': networked publishing of digital media (esp. audio) that is logically associated with a physical location, to be experienced by suitably equipped people in that location.

fredhouse gives the example of the work did at Mobile Bristol (for instance this paper). Previously we refered to this concept by location-based annotations (be it a written postit/message or an audio note).

Of course, this lead me to type 'placecasting' in google, then I stumbled across this placecasting.com website which is just an appetizer:

Placecasting: Broadcast anywhere. Experience anytime.

Let's talk about • Podcasts • Vidcasts • Webcasts • Gamecasts? Making them, getting them, living with them.

Stay tuned for more info.

Ok we'll stay tuned ;)