Linked UI is actually more than just an app, it's... a platform or a system, whichever word you would prefer to use.

http://research.nokia.com/research/linkedui

"It consists of a custom-built web runtime on top of QTWebKit, the Linked Internet UI Platform, written using HTML5, JavaScript, and a SQL database backend. The platform supports online and offline operation and is able to synchronize data with services for efficient offline use."

They're definitely doing some interesting work. I've met the guys a couple of times and exchanged some ideas with them.