Janette Williams of PSN writes in this morning's paper that six Audobon Society interpretive signs, installed 18 months ago on the Cobb Estate at a cost of $11,000, have instead become magnets for vandalism — excuse us, canvases for graffiti art.  Now, as someone once cautioned us, "there is actually a history to the role that graffiti art plays in our culture, and that in some quarters it IS considered art" — apparently people are upset, anyway.  Michele Zack makes a good point in the story that the signs probably weren't well-thought-out, anyway — a sad but true commentary on the state of things.