Acrossair's video shows that using the gyroscope in addition to the accelerometer and compass makes for a much smoother, much more accurate augmented reality experience. No more looking like you've got the caffeine jitters trying to find the nearest subway. [Readwriteweb]
iPhone 3GS only: The Nearest Tube iPhone app uses the iPhone 3GS's newly-adequate camera to show the direction of the nearest metro station by adding directional arrows to a real-time "video" you take of your surroundings. Seriously, check this out.