Here they are:
Aro - Michael Sheen (plays Lucian in Underworld and will be playing the White Rabbit in the 2010 release of Alice in Wonderland.)
Jane - Dakota Fanning (War of the Worlds, Push, Uptown Girls & Charlotte's Web)
Marcus - Christopher Heyerdahl (The Chronicles of Riddick, Blade: Trinity & The Invisible)
Caius - Jamie Campbell-Bower (Sweeny Todd and he will be in Harry Potter 7 as Gellert Grindewald)
Alec - Cameron Bright (The Butterfly Effect, Ultraviolet and Juno)
Sam Uley - Chaske Spencer (Into The West, Skins, Red Dead Revolver)
Quil Ateara - Tyson Houseman (New Actor)
Embry Call - Kiowa Gordon (New Actor)
Paul - Alex Meraz (The New World & Two Spirits, One journey)
Jared - Bronson Pelletier (Various episodes of various TV shows)
(Third from the right)
All of the Cullens are the same, as well as Bella, Charlie, Laurent, Victoria, Angela, Mike, Jessica, Eric and Billy.
I can get photos of the rest of the cast as well, but I figure those are the major ones.
