One of the latest Apple patents cites library-specific usage- this is regarding the iPhone, or any other mobile device they may create (third paragraph below). The specificity would imply that Apple has strong plans in that direction, and would also be reasonable as part of a counter-strategy to Google's interest and activity in library environments. It's especially interesting given the comments immediately preceding the library reference (multimedia streaming and delivery). Patent language is usually as broad as possible to cover all contingencies, while this given example is relatively focused:

The user's location could be determined by GPS, cell-tower triangulation, "dead reckoning", or simply by communicating with a local wireless access point. Content could be provided over the device's mobile telecom system, Bluetooth, local Wi-fi, or a direct-connect docking station.
That content could include "video content, picture content, audio content, multimedia content or routing content associated with a geographical area within a proximate distance to the device based on the location information."

The filing gives two examples. First, a user could walk into the public library, and a digital card catalog could be loaded onto that person's handheld. When the book-seeker leaves the library, the catalog would be removed from the device.

While that first example appears to be purely in the public-service domain, the second example moves closer to the realm of advertising. In that example, a restaurant could provide a menu app or URL to a patron, along with a second app that displays the current wait time on an icon. While the user waits, he or she could choose and order their meal from the menu app or browser page. When the user leaves the restaurant, the content disappears.

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