PhoneFinger transforms your Mac's mouse cursor into a realistic simulated human finger for testing and demoing iPhone applications and websites.
Why would you want to do this? Because of the iPhone's high-resolution screen, Apple's iPhone simulator may use an area on your Mac's display that's physically far larger than an actual iPhone.
This makes designing and testing user interfaces troublesome. Software that's easy to use with a magnified screen and the precision of a mouse can be difficult on the actual device. PhoneFinger puts things in perspective and reveals hidden usability problems.