Fone2Mouse

Fone2Mouse is an app that uses your iPhone as a networked mouse for a computer. It requires a program (the server) to be installed on the computer, but setup (at least on this Windows machine I'm using at the moment) was a breeze. The app even contains instructions on how to do this should you want to use a different computer. The app defaults to a three button trackpad.

There are plenty of cool options, but the only ones I could get working properly were a two-finger scroll and the ability to change the number of buttons. The app is only at version 1.0, however, so look for improvement in the future.
There are plenty of other options, such as the use of the accelerometer to move the mouse and to gestures to emulate arrow keys.

As it works over the network, your phone and computer will either have to be on the same wifi-enabled LAN, or your computer will have to have a public (not behind a router) IP address. Pointer movement is a bit reminiscent of a VNC session, but hey, if you need a trackpad, you need a trackpad.

I can invision using this app to perhaps flip through slides in a presentation, or maybe play a practical joke on someone who has left their computer unintended. Of course, if your mouse breaks, this can be a lifesaver until you can get a new one. Don't expect to win any Halo championships, however.

For concept, I give this app a thumbs up, but for execution, a sideways thumb for all of the broken features. I'll email the developers to see whether they have a fix in the pipeline and post here later about that.

Besides those mentioned above, what uses do you have for a networked mouse?