The
Dynolicious is a piece of add on software which turns your iPhone into a performance meter for $12.99 -
click here to find out more.
Problem is of course you have to sign up to a 24 month plan with a phone company with outrageous data charges to have an iPhone in the first place.
I read today that Apple have the means to remotely remove software from your iPhone! They say it's something they hope they never have to do, but claim it would be irresponsible of them not to build in the ability to do so.