Sexy Losers is a must read, few and far between for the past decade or so, but it's a joy whenever a new strip pops up in my RSS reader. Brings back all the joy and occasional eroticism of reading it at twelve.
Paranatural, even though I'm beginning to think that it will never be finished.
Belzebubs: the story of a death-metal band. Of course all of them are Satan worshippers, even the frontman's family (wife and two children).
It can be adorable.
My Life as a Background Slytherin. A girl called Emily goes to Hogwarts and she's assigned to Slytherin. Dumbledore's portrayal makes it a worth read. Parody comic, amusing enough, but it doesn't update very often.