Despite having no “real” SDK, that isn’t stopping the community of iPhone owners from finding their own ways to customize their iPhone as much as they can. Gizmodo has recently posted a very helpful guide that will allow you to use an application straight from the iPhone to install programs on it without resorting to any other hacks.
Apple has made it a tradition to listen to what their customers want. They announced the popular Boot Camp shortly after users “cracked” their Intel Apple computers and managed to install Windows on it. So let us hope that they will do the same for the iPhone, now that people have already cracked it.