I'm about to release an iPhone app I created a (very) long time ago.
It allows to browse through the whole iPhone file system, displaying files and directories, with infos and previews.
I doubt such an app will be validated by the AppStore team, but who knows.
I had to re-create the project with the new XCode 4, because it was created for iOS 2.
Now it's also ready for a future iPad version.
If it's not validated, I think I'm going to release the source code as OpenSource...
More on a few days...