I'm considering writing an infinite precision calculator for the iphone/touch. You would use it like a calculator, with a popup panel of buttons, and it would display as many digits as fit on the screen. If you want more, you simply flick across to see as many more digits as you want (until you run out of memory!). All calculations are done to infinite precision, so you are guaranteed exactly correct answers. I know how to do this; my question is, does this strike people as a cool idea? Is it a "meh, who needs more than 10 digits" or a "wow that is so cool I can calculate 500 digits of the square root of pi" idea? Would you pay $5 for the geek factor? Also, what other features would be worth having? Barney.