Famous iOS developer and hacker Pimskeks, has updated its jailbreak tweak to make it compatible with iOS 6. Safari Upload Enabler allows to overcome the limitations imposed by Apple for the Safari application, and adds support to Dropbox.
As you can guess from the name this tweak allows you to upload any files directly from your iPhone via Safari. With iOS 6 Apple finally introduced the ability to natively upload, but that for now it is still limited to just pictures and videos in your camera roll. Thanks to Safari Upload Enabler you can upload any file on any site, just as you do on the computer.
Just tap on the button of the site where you want to upload the file, it will open a new screen, from which you can explore the folders of the iPhone (including individual applications) and select the desired file or download it from your personal DropBox folder.