Grant Morrison's more-insanely-epic-than-usual DC project Multiversity begins today, which will try to tie pretty much every single part of every single DC universe into one coherent whole. This video is the best explanation of what Morrison's trying to accomplish I've seen so far — it's definitely worth a watch.
My favorite part of Morrison tidying up the Multiverse? That apparently the Phantom Zone and Hades are one and the same. Which means Kryptonians used to sentence their worst prisoners to hell. Apparently Krypton was far more metal than I'd been giving them credit for.
Thanks to my pal Brian T. for the tip.