Until now the topic of »location based services« has been more a theoretical discussion about geological references to online data. Now there are obvioulsy a number of developments (and some rumors) that try to create datasets with longitude/latitude metadata.
First of all hardware: The problem if tagging information with geological locations could be solved by hardware very soon. Cheap GPS hardware could be integrated in mobile phones, digital cameras and laptops. In fact there is a rumor that Apple is going to integrate GPS hardware into the next generation of PowerBooks.
Secondly the applications: The geo-tagging of data creates a connection of the docuverse with the real world. Here are two examples: www.plazes.com and www.geobloggers.com. Once the hardware is capable of recording geological positions and automatically querying the net with locations applications like these will automatically emerge. It is creating a new dimension for data as such.