| The content provided to AppleTV and iPhone isn't *directly* from YouTube's core system. Rather, the YouTube videos need to be translated into H264 format. A system has been built by YouTube and Apple that will do this automatically, and it is translating the entire library of YouTube videos into the new format.
At the moment, it hasn't finished this task, which is why the number of videos you'll have access to on iPhone or AppleTV is lower than the number of videos if you access YouTube from your computer. The translation is catching up quickly, though. I'd expect that if you find you don't get any new content for a few days, something may have gone wrong with the servers that are handling this translation.
Eventually (in a few weeks, at a guess) the entire YouTube library will be translated across to the H264 format.
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