I just installed Joomla 3.0 and I'm not great at it. Here's what I'm looking for though. I give Joomla my YouTube channel's url or the url of it's RSS feed. When I do it checks this feed at a set interval constantly and forever in the future. If during one of these checks, it sees I have uploaded a new video it automattically updates so that the video is listed.
I would actually recommend using something like Youtube Gallery. You can fully customize the output (though not into pages):
Here's an example of the type of page you can make with it:
Any time there's an update to the channel, it gets loaded into the site automatically.