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Crackulous: a simple program for hacking iPhone applications
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The program is quite easy to use and, unlike its predecessors, has a graphical interface. It is easy to install on iPhone or iPod Touch. Hack software can be literally in one go, after which it becomes available for installation on any other iPhone or iPod Touch.
Similar tools were available before, but because of their complexity, they were not widely used, so finding hacked versions of iPhone programs on the Internet was quite difficult.
An interview with the author of the program can be found here .
By the way, as some examples show , hacking a program for the iPhone can sometimes increase its popularity by orders of magnitude and even increase the number of sales.