The official YouTube app from Google is here for iPhone and iPod users. The YouTube app comes pre-loaded with the iPhone, since it's launch in 2007. The pre-loaded app was actually built by Apple, not by Google. Since it was not a fully-featured app, users are unable to access the full-functionality of the YouTube.
Now with the official YouTube app from Google, iPhone users are able to access Tens of thousands more videos on their iPhone and iPod touch. The app features YouTube channel guide, which reveals a guide
with your subscribed channels on YouTube, giving you instant access to
|YouTube for iPhone and iPod touch|