E.E. Knight has a few thoughts on Bitterwood at his blog. He writes the popular Vampire Earth series and a series with dragons as protagonists called "The Age of Fire." I'd been told about these books before but haven't picked up a copy, although I'll definitely be checking it out now.
Another novel I've been told about with dragon protagonists is Tooth and Claw by Jo Walton, which also goes on my reading list.
Other obvious examples of dragon positive books are the Pern novels and Eragon. Beyond these, what am I missing? Can anyone recommend other books where the dragons are fleshed out as full fledged characters?