Book-to-Movie Law states that once you have read the book, you are bound by the media to go see the movie based on said book, and therefor compare to two.
To clarify upfront, this was not a major movie release. It was a small-time, made-for-tv movie that aired a few times as a Lifetime Network Original in 2005. If this makes you groan, hold your judgement until you see it yourself (the movie is readily available in twelve parts on YouTube). I thought it was a very good movie, and a great adaptation of the book. Which, by the way, is one of my all time very favorites books I love to death. Anyway, if you didn't catch this movie on Lifetime, check it out on YouTube. Which is what I recently did. And it did not disappoint. Michelle Trachtenberg did very well as Carrie Bell- hitting her high points, but always keeping with a sadness to her, as though she is always missing her life from before. Kilroy (Sean Maher) was downright dreamy and BOY did that guy look good during those kissing scenes! Overall, I found this to be a very honest take on the book, and I do not think any reader or fan would be disappointed with the final result.
Bottom Line: The movie is TOP NOTCH, but not a full replacement for the book.