Apple TV has never been much of a success, at least judging by Apple standards. Most people don't even know it exists. One of the problems, as with any media device, has been lack of content. But that problem is getting smaller now that Hulu Plus is finally being made available for Apple TV.
Hulu Plus is the premium and paid version of the free online TV site. For existing subscribers, the process is seamless. The Hulu Plus app should show up on the home screen of the Hulu TV and all they have to do is enter their credentials.
If you're not a subscriber, you can create an account from the app or via the site. What's more, you'll be able to pay via your iTunes account so the process should be fairly straightforward. Hulu Plus is $7.99, €6.50 a month. Needless to say, all of this is available only in the US.