In all my digital shooting experience, I have had just one really outstanding case of moire that occurred with one of my D70 bodies years ago. I was photographing a police officer in a dark navy blue uniform under several SB800 speedlights. The uniform material was a rather course, tightly woven twill pattern of some kind stretched over his bullet proof vest and the moire stood out like a sore thumb.
Since then, I have photographed hundreds of officers in similar uniforms and conditions with D2X, D3, and D3X bodies without a single sign of moire patterns. I suspect that conditions have to be just right for it to appear.
From my personal perspective and experience, it is a non-issue. This is why I opted for the D800E model. As mentioned earlier, in a couple weeeks or so, I plan to experiment with the D800E and wafers full of Pentium processor chips with their dense, tightly packed arrays ... It will be interesting to see if moire patterns appear.
Regards to all,
HBB in Phoenix, Arizona Nikonian Team Member
Photography is a journey with no conceivable destination.