woah woah woah the guy asked that is currently popular.Right now Bleach and Naruto is loosing fans because of the fillers,only One Piece fans still have dignity because the story is epic even in fillers. Right now the popular animes are: Toaru Kagaku no Railgun,Seikon no Quanser,Butlers vs Maids,Darker Than Black and Fate/Stay Night Unlimited Blade Works Movie.
http://myanimelist.net/topanime.php Here you can see wich animes are in the Top