Today we were again in a family gathering. I took some photos from my youngest child and my nephews. Again I didn't use the sb800 which I always carry with me. I guess that for such informal shots carrying on camera a heavy flash like the sb800 is not one of my favorite things. So whenever I have the chance (the lighting ) I use only the onboard flash. All photos were shot with the nikon d300 and the Nikon 18-200 VR. From my experience (which were confirmed by various tests around the internet) the 18-200 seems to be extremely sharp up to 135 mm. From 135 to 200 the sharpness dicreases quite a lot.
I once shot a baptism with this lens and kept the focal lenth inside the 18-135 region. The results were very good and maybe comparable to much more expensive lenses

Nikon 18-200VR, ISO500 , 1/60 sec, f7.1,70mm

Nikon 18-200VR, ISO500 , 1/60 sec, f5.6, 170mm
Nikon 18-200 Vr iso500 1/60sec f5.6 150mm