Morozevic - Leko was the best game from round IX, and you can download it with my annotations here: moroleko.cbv.

However, one of the most embarrasing games in this round was Carlsen - Aronian:

Carlsen,M (2690) - Aronian,L (2744) [E15]

XXIV SuperGM Morelia/Linares MEX/ESP (9), 03.03.2007

[pgn] 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.b3 Bb4+ 6.Bd2 Be7 7.Bg2 c6 8.Bc3 d5 9.Ne5 Nfd7 10.Nxd7 Nxd7 11.Nd2 0-0 12.0-0 Rc8 13.e4 c5 14.exd5 exd5 15.dxc5 dxc4 16.c6 cxb3 17.Re1 b2 18.Bxb2 Nc5 19.Nb3 Nd3 20.Re2 Nxb2 21.Rxb2 Qxd1+ 22.Rxd1 Rfd8 23.Rbd2 Rxd2 24.Rxd2 Rd8 25.Rxd8+ Bxd8 26.Nd4 Bc4 [/pgn]

Do you recall this position? the first 26 moves are exactly the same as the game Topalov - Leko, from this same tournament. Topalov here played 27.a4 followed by 28.Nb5, but the game ended in a draw fairly quickly after 28...Bxb5. Carlsen's 27th move is definitely not an improvement:

27.Bf1 Bd5 28.Bg2 Bc4 ½-½

I've read Carlsen Dad's blog, and Magnus claims that he was surprised by Aronian's opening choice and little by little he was (magically?) driven into the position which Topalov played.

I have another theory: Carlsen is quite happy to draw against any player who is in the top 10 of FIDE's rating list. This is actually quite normal in the developing stage of a player, and it's not easy to overcome the intimidation factor that a player of such level can have on a 16 year old. So, let's give him some time!

By the way, I honestly thought that Carlsen would go for 1.e4 in this game. He's been getting quite harmless positions with white playing 1.d4. He really is a 1.e4 player, I don't understand his opening choice. But Ok, I admit my prediction was just wrong.