I purchased the new Apple TV so I could watch 1080p content, but when I search for stuff in the iTunes store, it usually just says "HD". Sometimes it specifies "1080p" and sometimes it specifies "720p", but often it simply says "HD" and provides no further detail. How am I supposed to know what content is available in 1080p? This is in the Canadian iTunes store, btw. Maybe it's different elsewhere.