Star Trek

Immediate Family: Kids, Queen's Hot Space CD
Family Gossip: Kids got the order of colors right (red/blue/green/yellow). Star Trek got it wrong.

Inception

Immediate Family: Dark Knight Teaser, Watchmen Teaser
Distant Relative: Escape From New York

Lightning Thief Teaser Poster

Distant Relative: Alien

The Wolfman

Immediate Family: Traffic, Jack Kirby's "floating heads" comic book layouts
Distant Relatives: Platoon, Freejack
Family Gossip: Del Toro and Hopkins were both floating heads on other posters!

Remember Me

Distant Relatives: Forces of Nature, Singles

The Lightening Thief

Immediate Family: Peter Pan, Harry Potter and the Half-Blood Prince
Distant Relative: The Day After Tomorrow

Daybreakers

Immediate Family: 30 Days of Night
Family Gossip: I'm a big fan of the 30DON poster, so when I saw Daybreakers, I was disappointed to see that someone had ripped it off. But then I looked into it: both posters come from the same design house. I'm not sure if that makes it better or worse.