If, like me, you have wearied of a steady diet of Pixar and Disney animation, you will be intruiged and dazzled by "The Secret of Kells." The movie is visually astounding, but not in any of the usual ways. Much of the animation reminded me of the Cartoon Network's "Star Wars the Clone Wars" series, which itself is reminiscent of series like "Speed Racer." With "Kells," however, stylized simplicity becomes quite simply magical, and a vehicle capable carrying a fascinating and true story/legend forward.
And the movie is remarkably true to what is known and passed down about The Book of Kells (a real text, now housed at Trinity College in Dublin, Ireland). Be aware, that this faithfulness to story does mean there are harsh (though, again, stylized) depections of the Viking raids upon the Celtic settlements. This was scary for both my five and eight year olds; yet they stuck with the movie to the end. I had a great conversation with the older child afterwards about why the Vikings were shown as being inhuman (think the Huns from Mulan, except a step further), in which we reached the conclusion that it was because they chose violence and showed no mercy.
I do want to note that the ending of the movie is blatantly religious, although not offensively (in the sense of proselytizing or judgement) so. Even if your family is not religious, however, "The Secret of Kells" could serve as fascinating fodder for a conversation about belief, fanaticism, and --oh yeah-- fairies.