While not DC or Marvel, the Spawn animated series from 10 years ago was rather gory I believe, but that aired on and was produced by HBO. And well. . . it's Spawn. They're making new series about Spawn if anyone is interested.
Gotham Knight was alright, but not that great imo. The only section I truely liked was Crossfire by Production I.G. It's the one where Crispus Allen and Anna Ramirez get stuck in the middle of a mob fight between the Russian and Sal Maroni.
Oh, and all the Batmans were voiced by Kevin Conroy. That was a plus.
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The Black Panther is getting his own show this year in stop motion comic form(saw a rough-cut trailer and I didn't like it) and Thor has a 26 episode animated series scheduled for released late by 2010. Both by Marvel.
http://marvel.toonzone.net/news.php?...ullnews&id=131