Even if you thought Billy Elliot was a load of torrid guff, these articles on the Times Online site are all pretty good (as I’m in search of a working method at the moment, they are especially interesting)...
How John Hodge adapted Trainspotting
Sir Tom Stoppard on writing Shakespeare in Love
How Lee Hall wrote Billy Elliot
David Hare on adapting The Hours
Also, want to know why The Golden Compass was a frustrating grab bag of exposition and all round rubbishness? Let Sit Tom fill you in:
I wrote the first draft of The Golden Compass, but no director was attached to it. Ultimately it got a director [Chris Weitz] who liked to write his own scripts. He never even read mine.