How can I play music from my iPhone through my computer? Now that I've had my iPhone for a few months, I'm trying an experiment to see if I can't replace the laptop I carry around with my iPhone + internet connected computer. To this end, I've been trying to find a program that will let me play the music on my iPhone through the hardware and software on the host computer.

If I recall correctly this was possible a few years ago with the iPod - Linux software like Rhythmbox and Banshee was able to read the music off an iPod and play it through the speakers. I even thought I recalled iTunes itself being capable of this at one time.

Now, however, iTunes greys out/disables the music on my iPhone and I can't find any documented support for the iPhone in any other music program. Is this really no longer possible? Am I limited to using the headphone jack to get music to play?

(note: I am using an iPhone 3G with the 3.0 software. I am attempting to play music on computers other than the one I sync with)
I know I'm replying on an old question, but I came in here googling.
My iPhone 4 had the same behavior, I just updated to iTunes 10 and I my music is no longer greyed out.

In essence: upgrade to iTunes 10 and you should be able to do this.