1. Favorite book-to-screen adaptation?

The Circle by Mats Strandberg and Sara Bergmark Elfgren. I think the movie was actually better than the book, which wasn't bad either.

2. Movie tie-in covers yay or nay?

Maybe?

3. Book you most want to see adapted to screen?

Almost anything by Diana Wynne Jones and the other books in the Circle series.

Source: http://crimsoncorundum.dreamwidth.org/187589.html