Grischuk vs. Rublevsky attracted my attention the most.
http://chessbase.com/news/2007/elista/games/cand07.htm
I think starting from move 17. Rae1! Rublevsky had misread the move and played Nd7?
Grischuk might be smiling when he played 18. Nxd5! and made Rublevsky suffered till the end.