My favourite one huh... I got a few... My all time favourites are Bakuman, K-On, Natsume Yuuchinjou, SKET Dance and Hachimitsu no Clover,
But then.. you add the 'right now;, so I presume you're talking about currently airing ones. My favourite one this season is probably Golden Time and Kyoukai no Katana. But then again, I am only watching 6 this season, and I am loving all of them.
What about you?