Looks like David Goyer is writing the script for the THOR movie. Goyer also wrote the Blade Movies and Batman Begins. Thor is a tough one... rarely has he ever been done right in the Marvel comics, so there's lots of room for the movie to suck. It should be rooted very much in Norse Mythology and NOT campy. Think Peter Jackson's Lord of the Rings, but with a big Norse God of Thunder.
Recommended THOR reading material:
Thor Visionaries: Walt Simonson Vol 1-3