UK's Daily Telegraph calls the Node location based portable media player the Hitchhiker's Guide to the Galaxy from the Douglas Adams book.

The node Explorer is a location aware media player that allows users to listen, watch and interact with video, audio and textual content specifically relevant to who they are, where they are and what they are looking at, indoor and outdoor.

Node offers a complete platform to enable organizations to provide enhanced experience for city visits, or museums or sport events.
More details on the node site. Via Slashdot.

More and more handhelds have GPS. PDAs, Game Consoles like the Gizmondo or some upcoming portable video players. So a service like node offers can become something a wider range of gadgets could work with if the content is open.