I have not read the book yet, but after seeing the film I went out and bought a copy. Julia Roberts is wonderful in this movie, and it's very entertaining and pleasing to watch. Sad at times too, but beautiful and also real.
I loved this movie enough to see it twice. I don't know if it was because of the 3-D, but I felt intimately connected with the characters, much more so than I do with movies usually. I wanted to become a N'avi too and could see how I would fit into the world of the N'avi of Pandora. And it made me think a lot about my own life and what I can do to live more in harmony with nature. I am sure I will want to watch it again and I look forward to the day my kids are old enough to see it.