e.Digital Corporation (fka EDIG)

[Tinroad]

Apple's secure one-way transfer to iPod is a 2-way street:
http://podmanager.brunoblondeau.com/

Also, for the DIY crowd:
Apple has made it a bit tricky to use the iPod to swap songs between two Macs -- but only a bit. I did it by turning off the automatic synching feature on my home machine and dragged songs onto the iPod. I then connected the iPod to someone else's iBook. That iBook already had iTunes 2 installed, and had already been linked to another iPod.

The iBook noted that this was not the usual iPod, and asked if I wanted to wipe all the songs off the iPod and start over. I said no. But the iBook recognized my iPod anyway, and let me drag songs off of the iPod and into the iBook.

In other words, by turning off the automatic sync functions and saying "no" when asked if you would like your iPod library erased, you can simply drag and drop your iPod music files from iTunes to another Mac.
http://www.macobserver.com/article/2001/10/29.4.shtml