Today iPhone is one step closer to gaining third party software support, unofficially of course. Hackers from the #iPhone IRC channel managed dissect embedded OSX's source libraries and create a basic proof of concept application that does nothing more than display the words "Hello World". The devs have now released these source binary files on public servers, available for anyone to download.
This is by no means the final solution in opening iPhone to software developers (that will come only through Apple), but I'll take third party software any way I can get it. Even it is the result of a raped and violated hack 'n slash effort.