chess.com university: http://www.chess.com/groups/notes/chesscom-university.
It's not free.
I noticed that, as well. Kind of similar to ICC's microtransactions where you can purchase advanced video lessons.
Then again, ICC isn't exactly being wallet friendly lately. Sure, I can get three months for $19.95 and this gives me access to a ton of videos already but now there are dozens upon dozens of new videos up that need to be purchased separately to be viewed. I didn't even realize how expensive they had gotten but many of them are over $10 at this point. I have to say that this is a strike against them in my book. It's just going a little too far now.
I'm already getting really comfortable with the site here on Chess.com. Much moreso than when I was tinkering around with things in the fall. I like a lot of the site's updates and I think I may just wind up keeping my diamond. We'll see. It does seem as though Chess.com is a good fit for my skill and level of experience at this point.
Chess.com really needs a referral system and/or other ways to earn free premium time. It's a win/win for both the site and the community.
edit: Scouring the site I now do see, under the widgets and banners section, that we do in fact have a referral system in place. This needs to be advertised and pushed more. The fact that one referral = one month of premium is pretty cool. Here's the thing, though: Is it one month of a diamond membership?
chess.com university: http://www.chess.com/groups/notes/chesscom-university.
It's not free.