The newer Pokemon anime episodes. I don't care how bad in principle they are, I love 'em.
Princess Tutu is also on the list. Excellent anime, but I felt a bit of reluctance at telling even my girlfriend, knowing that I wouldn't hear the end of it. And I was right.
Also, Hetalia. Though I justify it by saying that I stick through it only for the yandere character Belarus, and how she tortures those around her. Which is a half truth. >_>
Music-wise, Scissor Sisters are high on my guilty pleasures list. There's absolutely nothing about them that I should like, but just something keeps them from getting out of my head.