Django was very much a silent guest for the first couple of weeks we had him. He is now rather vocal at times, especially towards people he hasn't met before. When he has these woofing outbreaks we've tended to try and ignore him and he usually settles down.
All in all I think the woofing is probably a good thing as it seems like he feels he has a voice, though recently he has turned the woof on us. He will be having his mad hour, running around and playing with things, then he'll get a bit over excited and start barking at us. He is just playing, as his tail is still wagging, but it is very loud and not always that easy to deal with. Again, we just ignore him but it doesn't seem like an ideal solution. He'll still be running around and making a lot of noise.
Mike...I found with my boy Mason a similar thing, quiet the first few weeks and then as he found his feet and became comfortable he started to bark and whine to play relentlessly, particuarly when I was on the phone. I found if he ignored my telling him "No", putting him in the hallway and closing the door (I have glass paned doors so he can still see me) did the trick. After a few minutes he would give up and lie down and when he was allowed back in would settle. Now he almost always settles down when told No, knowing the alternative is being sent out the room - almost always! Hope this helps
I can agree with Toots and Siouxsie in my experience. Biscuit still trys to "make" me play with him on his terms by play barking, and I often put him into another room, where he can see me thru the glass, and he always stops when he sees he has been excluded, so it's a very quick and effective solution for me. I always open the door when he stops and tell him he's good.