I used ot think golden compass/northern lights , and the entire trilogy actually, would make a fantastic movie... but god damn did they fuck it up...
I love Paulo Coolho, but since his books are like 90% internal monologue they wouldn't make very good movies... however i think some of them could work really well as an anime series like Brida or The Alchemist. Anime or just cartoons lend themselves much better to stories focused on internal thoughts, since you can use a lot of techniques and imagery that would just look out of place in a live action production. Wouldn't have to be anime, could be a cartoon as well, its' just western cartoon dont normally do mature (and not the blood and sex mature, but sophisticated don't treat your audience like they have half a brain mature) stories in the same way some anime series do.