iPhone hacker hachu developed a plugin for Mobile Safari recently that allows users to download any file off the internet. Once opening up the page, a button that says 'Download' will appear before Quicktime, or any other media has the chance to load. All downloads will be saved into /var/root/Downloads, allowing you to use the media online, or offline.

Right now there is not a way to play back your downloaded files on the iPhone, but Erica Sadun has come up with a mod to play back MP3's, video, or share the files via email. Not sure if this works yet, but it's an excellent idea on the part of the iPhone dev team. Now it should be pretty easy to make a small media player replicating the iPod app to play back downloaded MP3's.

[Via TUAW]