Apple's put together an "iPod 101" site as a one-stop spot for iPod information:
If you're a new iPod owner or simply need a refresher course on how to get the most out of your iPod, you've come to the right place. Welcome to iPod 101: Your guide to rockin' out, gettin' down, and boogieing with your iPod, iPod nano, iPod mini, or iPod shuffle.via Lifehacker.
Whether you're a Mac or Windows user, iPod 101 contains tons of information that'll help you enjoy your iPod to its fullest and guide you on your way to becoming iTunes savvy (we're using iTunes 6 in our course materials). Get ready to walk through the virtual aisles of the iTunes Music Store; learn how to sync your music, contacts, calendars, and more; admire your pretty pictures (and force others to do the same); watch TV shows and video; and find out what to do when things don't go as planned.