iPhone is designed not to be able to transfer content that way. You can import photos and videos ( http://support.apple.com/kb/ht4083 ) but there are limits/restrictions. For example, you can sync music that you downloaded from the internet to the iPhone, but not transfer it back to a computer. This has everything to do with music rights/legal stuff, you can only transfer purchased items from the phone to a computer using iTunes.
hope this helps !
Also, check out: http://support.apple.com/kb/HT1296
Message was edited by: jesterwylde