All this talk about wooden acting forces me to comment:
We are talking about The Silmarillion, yes?
...do I really have to say it? Okay I will. The Silmarillion is all about the woodenness. All these "stoic" actors would be absolutely perfect for such a book.
I was all ready to jump around screaming "Keira Knightley!" but then Oddwen stole my thunder.
I must now go pout.
Okay, I'm back.
I think Richard Dreyfuss should play Eru and we could rename the story "Mr. Iluvatar's Opus."
Also, Johnny Depp should play Beren, as this would provide him a wonderful opportunity to play yet another character with "hand" in his surname.
Hayden Christiensen really needs to play Turin Turambar. Not Feanor. Come on, think about it! It would be "perfect."