Here's a clip and two featurettes for How to Train your Dragon 2.
Dragons: Riders of Berk - Episode 1
Here's the first episode of Dragons: Riders of Berk, a new CG series based on How To Train Your Dragon.
How to Train Your Dragon: Gift of the Night Fury
DreamWorks have released a 22 minute animated spin-off of How to Train Your Dragon, called Gift of the Night Fury.