Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.
I would also like to see many more tech article and much fewer political ones. Especially ones about the NSA, this is one instance where it would be nice if there was some kind of partitioning to HM, possibly like reddit.