I don't know when it was, but at one time Avenger's Mansion was Sovreign territory, I don't know what happened with that.
I was also pissed to find out that the New Avengers (Much like The New Fantastic Four) was just a shortlived team used to sell more comics before dumping readers back into the same old shit. Spider-Man and Luke Cage are going back to their respective places, no doubt Wolverine will go off and do his own thing, I don't know ANYTHING about Ronin at all, but SpiderWoman, Captain America, Iron-Man, and Sentry will probably stay.
On another note, I hope they never bring back Jack of Hearts, what a waste of ink. The guy spent his time in the comic dying, I mean so did Iron-Man origionally, but he got better, not worse.