NPR's Robert Smith sent us this audio postcard from the main gate of the Pepsi Center in Denver.

NPR: Postcard From Outside The DNC

Analysts and proponents of the technology say it could be used to build apps that direct users to their gate at the airport, provide audio tours in museums or push offers to consumers based on where they are standing inside a store.

WSJ: Apple Buys Indoor GPS Specialist

It is a guess based on the size of the storage that has been purchased, the fact that video consumes far more data than audio, and the introduction of a simple audio locker or cloud-based version of iTunes is unlikely to require this much storage and capability out of the gate.

FORBES: Apple To Launch Video-Focused Cloud Service, Jefferies Contends