Things that do fall into the category:
Kick-Ass (Which in some ways is darker than Watchmen, and yet also more amusing and more rewatchable.)
Soon I Will Be Invincible (Which is actually a book, but i'm definitely going to read it again at some point.)
I really need to watch Sky High. I've seen part of it and it seems like it _might_ fall into the same category. I also keep hearing about Mystery Men as well, and i really ought to check that out at some point. Monsters vs Aliens definitely had some of the same feel to it, though it was aimed at deconstructing a slightly different genre.
Can anyone else think of any examples that i've forgotten about? Or better yet aren't even aware of yet and ought to check out? :)