I just did another one which is a good example of where I feel the camera is a little weak (though I've not had the opportunity to see how others handle the same type of situation either), if you look at the a crop below you can see edge artifacts caused buy the abrupt change in colours in the paint work:
http://members.ozemail.com.au/~audiob/temp/IMGP6024.jpg http://members.ozemail.com.au/~audiob/temp/IMGP6024a.jpg http://members.ozemail.com.au/~audiob/temp/IMGP6024b.jpg
Thanks for posting these and earlier crops, Rob. I would just mention that JPEG compression also introduces artefacts that look very similar to the ones you mention here - did you check the web versions to make sure that nothing extra was introduced?
S
