>>There is no charge to transfer music to an iPhone that I know of.
>>
>>With iTunes open:
>>If the music is on a CD, just put the CD in the drive and iTunes will ask if you want to import the music.
>>
>>If the music is in another format (such as wma or mp3), click "File" and then either "Add file to library" (for a single song) or "Add folder to library"(for multiple songs). iTunes will ask if you want to convert it and say yes.
>>
>>FWIW, the new version of iTunes is finally (IMO) showing some real promise. Love the interface!
>
>Ok, thanks

There is a software called MediaMonkey that is supposed to let you transfer music for iPhone but I had problems using it recently. Perhaps they didn't have a version for the OS of my iPod.

But like Phil said there is no charge when transferring music from iPhone to iTunes or from iTunes to iPhone.