On a related note, the new and similarly-architected Financial Times iOS app is impressive (with full ft.com content freely accessible for the launch period)
As we understand it, Project Spartan is the codename for a new platform Facebook is on verge of launching. It’s entirely HTML5-based and the aim is to reach some 100 million users in a key place: mobile. More specifically, the initial target is both surprising and awesome: mobile Safari.
Yes, Facebook is about to launch a mobile platform aimed squarely at working on the iPhone (and iPad). But it won’t be distributed through the App Store as a native application, it will be entirely HTML5-based and work in Safari. Why? Because it’s the one area of the device that Facebook will be able to control (or mostly control).