Our first two, Rock and Rascal almost never barked. But Indiana is a totally different story. He barks when he's bored, when he sees the neighbor (who encourages Indy to 'talk' to him), when he wants someone to play with him, when he feels a change in the wind...you get the picture. He really likes to hear himself!! We taught him to speak because theoritically it's easier to teach him to be quiet. I say it's a theory because it has been a dismal failure for us. We'll keep working on him.
He also is famous for grumbling when he's walking away from you when given a command he may not feel like obeying but knows he has to.
All in all he is the most vocal dog I've ever had the pleasure of living with. He's great!!!