The movie is different than the play is different than the book.

I have seen the play and I went to the movie to see something new, and I have mixed feelings about what I saw... but I'm not concerned simply because it was different.

There is a new song that doesn't sound like the rest of the songs (you know that sound I'm talking about) so I don't know if it really "fits", but I liked it well enough.

Old songs have been changed.

You will hear these songs sung in a way you most likely haven't heard before. Not necessarily better, just different than they are usually sung (emphassis and the like).

Da Ali G is in it.

I was hoping the movie would be (for me) the hands down best version of the play I had ever seen. Some parts were, specifically "I Dreamed a Dream" and other parts weren't (specifically all of Russel Croon). Given the chance to see the movie or the play again, at equal cost and inconvenience, I would see the play. However, movies are convenient.

I'm surprised no one has talked yet about the way the songs were filmed, with the actual singing performances being done on set, in costume instead of in the studio beforehand- http://www.youtube.com/watch?v=0cDVdg7gVdg