Thanks. My old (current) passport hasn't expired, and I have already added pages to it. It's now close to full so I need a new one soon. (And I prefer not to walk all the way to the Chinese Consulate in the cold but looks like I'll have to). I really would like to keep the old book for keepsakes (love all my stamps).

So if I send in my old unexpired passport, they'll mail the old and new ones to me?