I have no idea. Graphic novels are all I read because I find it's just easier to read the compilations than keep up with individual issues. It's also easier to not get worked up about continuity and whatnot...I read them like individual books without much worry about what's happened before or after.

No -- after Hush, Jason Todd came back to life for real because (as goszzy said), Superboy Prime punched a hole through the walls of reality.

Ok. I thought he was joking. Now that I think about it I think I do remember something about that. Fuckin' Superboy Prime