Safari Download Manager for the iPhone (also know as SDM), has been available to jailbroken users since August. This $2.00 extension adds a fully integrated download manager into your Safari app. There have been a few others just like it, however most of which prevented you to continue browsing after beginning a download.
This app does wonders if you download files often and even if you don't. This is a tweak that I feel should have been included by Apple, but of course, why would they want to encourage data usage....duh.
SDM allows you to carry on with browsing while downloads take place, and will even download in the background.
Safari Download Manager can configure filetypes, custom file types and mimetypes to the download lists.
Although SDM may be old news as it was released in August, today there has been an update to the extension bringing it to version 1.3.1-2.
On a side note, this Download Manager will NOT open your files. I would suggest something like iFile if you want to manage your files.
Safari Download Manager will not work on iPhone OS 2.x.
I've tried to get in touch with the developer about the new changelog for this, but have been unable to do so. I will update this when I get the information.
Note: Image header at the top of this article is NOT a real screenshot.
Changelog for 1.3.1-1- Fix the bug where, occasionally, iFile would not launch (if the filename had spaces in it.)
- On installation, make sure ~/Library/Downloads is owned by the user so that downloads don't fail immediately on start.
- Fix some minor rotation issues.
Changelog for 1.3- Fix the bug where the New Tab button would disappear.
- Fix the bug where the application would become unresponsive after streaming video.
- Add many more filetypes and complement all known file extensions with MIME types.
- Do not prompt three times when the user taps "View".
- Download primarily based on MIME now, save for a few extensions that are always on (MS Office Documents, etc.)
- Add support for an SBSettings toggle, which is to be released later.

