But this is probably the best book trailer I've seen so far:
We set up the story (well enough even for someone not already familiar with the world), capture the tone, and get the pace. The visuals are great; I especially love when Tessa turns into a vampire. It's exciting and scary... just like much of the book. We set up the basic story with written words and intense music, but throughout we get voice over that lets us know our main character. Then at the end we get glimpses of the other characters and the action. The last part about the first kiss was a great scene to include. Clare is really good with love triangles and I had a lot of fun while I was reading trying too figure out who that first kiss would be with. The whole thing ends with some great animation, intense music, and a reminder that we already love Clare and the shadowhunter world she's created from The Mortal Instruments.
I think one of the reasons this trailer worked so well is that the book followed through with all the promises the trailer made. Watching the trailer again actually made me want to go grab Clockwork Angel off the shelf and start rereading it.