This text should be considered as a step-by-step approach of converting an iPAQ to a GNU/Linux operating system, onto which the Opie application suite will be installed. Of course, you can choose to install some different softwares (like the X11 system), but I chose this alternative to provide a strict replacement to the original softwares, and I considered Opie as one of the most advanced projects.
Although a lot of things on this can be found on the Internet (especially at http://www.handhelds.org), I think there is a need for a self-contained source of information that can help everybody achieve this transformation successfully.