If you choose not to automatically load content onto the AppleTV you will need to set up what content to load. Adding content to the AppleTV is easy. It is just like loading an iPod. The unit will appear under "Devices" in iTunes and clicking it will reveal tabs that you will be familiar with if you have an iPod. There is a tab for movies, TV shows, music, podcasts, and photos. Each tab has settings for what should be loaded on the AppleTV. Audiobooks will appear under music. (figure 2)
You can set AppleTV to only load new and unwatched video or all videos, only checked music or all music. You can also have the AppleTV see everything in iTunes, even content not loaded onto the AppleTV unit. This will allow for streaming from iTunes and save a lot of space on the AppleTV drive.