It’s the concept of serving web pages directly from a mobile phone connected to the network.
The plan is that every mobile web server will be provided with global URL.
If every mobile phone or even every smartphone initially, is equipped with a webserver then very quickly many websites will reside on mobile phones. That is bound to have some impact not only on how mobile phones are perceived but also on how the web evolves.
Further reading at the Nokia OpenSource Wiki – Mobile Web Server describes some very interesting scenarios for possible use cases. In particular, one such scenario:
When every phone has a URL and there is a web service interface to calendar, it becomes straightforward to create a peer-2-peer based distributed calendar application without any centralized server.
This is really really cool stuff coming up. Can’t wait to see how this pans out.