FileMagnet

Simply put, FileMagnet is an application which allows you to store miscellaneous files on your iPhone. Because the iPhone doesn't provide any type of "disk mode" like most iPods, the application stores files within the apps personal storage space. FileMagnet requires a WiFi connection to wirelessly transfer files to and from your phone. Additionally, to access the files, the component FileMagnet desktop app is required, which is a free download.

The app requires a Mac and FileMagnet to actually get the files onto your phone. To add a file, open FileMagnet on both your Mac and iPhone, then drag your files over. Once everything is copied over WiFi, you're free to close both apps. There doesn't seem to be a limit as to what you can put on your iPhone, but you are limited to the types of files you can read.

The Good: FileMagnet is fantastic for those who simply want something to transform their iPhone into a glorified thumb drive, but FileMagnet gives you quite a bit more to work with. In addition to storing the files, you can also read many common filetypes right from the app. This includes iWork and Microsoft Office documents, RTFs, etc. You can also play almost any audio file, as long as it doesn't have copy protection. Video files work, but it's limited to what the iPhone can natively play. Even cooler, you can add Safari web archives for offline web viewing. PDFs and images work as well.

The FileMagnet app works both ways, too. If you ever lose a file that you have on your iPhone, you can easily download any file through the FileMagnet app.

There is one great advantage to the companion app. If your iPhone isn't handy, you can still queue up files to be transfered the next time it's available.

The Bad: The obvious downside to FileMagnet is that it requires a companion application on your desktop to transfer the files. If you have a Mac, it's not a big deal. But if you own a PC, you're out of luck. There aren't many options either. There are no security options, no way of telling how much space you have available, and your iPhone will turn off after the normal time even if you're transferring files.

Bottom line: FileMagnet works great and does everything that it's supposed to. You can read all sorts of files; basically anything the iPhone can natively read. This gives you the ability to quickly transfer media and documents that might otherwise amount to a painful task if done through iTunes. The companion software only works on the Mac, so PC users should avoid FileMagnet (at least until they make a PC client). It also lacks quite a few options that are available on other applications like Air Sharing, although it is a bit cheaper.