Detective #880, it sucks that the last issue is next month, because I can't say enough good things about the story.
Barbara Gordon (not Oracle, Jim's ex-wife) got infected with Joker Toxin, everyone's freaking out, and Dick finds Joker:
it was James who poisoned his own mother, and the last page is him right behind Babs choking her.
X-Men Schism #2, I think it lost me this issue, but I'll put that in the X-Men thread (it basically boils down to more super smart kids, only jacked up to an insane degree). But here seems to be the first split between Cyclops and Wolverine:
Quire arrives on Utopia requesting Asylum. And then Steve Rogers calls Scott looking for him: