Only way I've been able to do it is through my MBP then airplay to the ATV.
Side note: Airplay through MBP is fantastic! Just started playing around with it. Definitely prefer it to my iPad/iPhone because it has much more content available (especially through Hulu+) and frees up my iPad to use on the couch.
edit: X-Factor doesn't appear to be on H+. Only knew about the voice because we watch that one.