The kids and I decided to quickly read HOW TO TRAIN YOUR DRAGON, "translated" by CRESSIDA COWELL, before the movie came out. It was a wonderfully fun little book and seemed to appeal equally to both my 6 and 10 year old. There were a number of nice little jokes in the text and I thought the scratchy, scribbly drawings inside were fantastic. Looking at the movie trailer, though, it doesn't look like it mirrors the plot of the book much.
I would give a synopsis, but it's pretty much all there on the cover. To be a little more specific, though, Hiccup Horrendous Haddock III, a.k.a. Hiccup the Useless, is a young Viking who, along with his peers, is directed to capture a young dragon and train it as his entrance into manhood and the tribe. Things predictably don't go all that well for Hiccup, but he manages to keep plugging along and, eventually, his particular strengths come in handy.