Saw Coraline in 3D today with dh and the dds (aged 6 and 4). We all enjoyed it - the animation is awesome and the story is gripping. However it is very dark, essentially a horror film, so if your dcs are sensitive you should think carefully before taking them. There is a creepy sense of menace throughout much of the film, building to a lot of scary scenes in the second half. Much of horror is quite psychological, involving betrayal by a trusted figure and revelation of rotten/wretched reality beneath a seemingly pleasant exterior. I myself found it scary (though not in an upsetting way) and shall never look at buttons in quite the same light again! Despite the horror there is almost no actual violence shown.
There are some beautifully-animated sequences with lots of quirky touches, and some humourous light-relief involving Scottie dogs and a mouse circus which had me laughing out loud. The character of Coraline is strong, sympathetic, and credible.
Recommended, as long as your dcs are not too easily-scared!