The regular Green Lantern
book takes place in the present day, years into Hal Jordan's career. There is speculation that the rebooted DC books will feature heroes 5 years into their careers. I believe the GL movie is supposed to use Parallax from Green Lantern: Rebirth
, but don't think they'll be using the Five Inversions/Sector 666/Manhunters stuff.
Batman: Year One
is a really good read. You'll probably recognize a few bits from it that they used in Batman Begins. Superman: Secret Origin
was okay IMO, but I prefer the John Byrne Man of Steel