Ooh, K-On! is actually one of my favourites too! I love how relaxing the anime is and it always makes me full of glee when I watch it. <3 I'm a Ritsu fanboy, haha, which one do you like? And uh, I think my favourite anime would have to be FMA:B, Grisaia no Kajitsu (Though I have a feeling that will change soon once I read Saya no Uta) and my favourite manga has to be either One Piece or Pandora Hearts. How about you?