MediaMonkey is a popular free media player for Windows. It has a great feature that allows you to transfer to and from an iPhone that is not registered with your computer. Normally only one iTunes install can be associated with your iPhone, but MediaMonkey allows you another way to transfer music and audio files with a ‘guest’ iPhone. Check it out, it works:
DavidCraddock.net 
exactly how do I transfer tracks from computer to iphone 4S?
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Hi Charles,
This was written a year before the iPhone 4S launch. I don’t have a 4S to test it on, but it seems that the latest version of MediaMonkey doesn’t yet have a way of transfering music to and from the 4S, according to this forum: http://www.mediamonkey.com/forum/viewtopic.php?f=12&t=61166
. HTH.
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