Do you already (proudly) hold an iPhone in your hand?
Are you just thinking about buying one? (Why just thinking?)
Anyway, you'll find plenty of info on the official Apple iPhone manual, available in PDF from Apple web site, all 124 pages of it!
Plenty of interesting features, ideas and (for us) things to be done on the glamorous Widget side!
"iPod on iPhone works . . . just like an iPod! iPhone syncs with iTunes on your computer
to get the songs, movies, TV shows, and other content you’ve collected in your iTunes