I'm going to start using my wife's 80G iPod (with her songs on it.)
I want to add my songs from my MBP onto it, but not to put her iPod songs onto my computer.
When I connect them, will the steps be fairly self-explanatory?
The following article provides instructions for adding your music to her iPod without disrupting the iPod's content, or your computers' content.
See the section titled "Manual Mode."
All the best,