pearPad - iPhone as a trackpad/keyboard for your Mac
pearPad is a two-part application that lets you use your iPhone or iPod Touch as a wireless trackpad or keyboard for your Mac. There is a program you run on the Mac - available for Tiger or Leopard - and a program from the iTunes App Store which is run on the iPhone or iPod Touch.
It supports configurable swipe-gestures (quick strokes across the iPhone/iPod Touch screen, for example convenient to quickly switch photos in iPhoto or Aperture), mouse cursor positioning (like a trackpad), scrolling with two fingers, text-entry using the default virtual keyboard, or key-combinations (like Command, Shift, Control) provided by a special onscreen-pad, for example for sending keyboard-shortcuts.
From the screenshots available on the pearPad website, the trackpad mode takes up the full screen so once set up it could be used without needing to look at the screen of the device.
I have been wanting a wireless external trackpad for years... just a pity that I would never get one funded that's so expensive!
- Ricky Buchanan