Certainly one of the more interesting images on this site - excellent detail, and once you see what it is, you end up staring at it for ages, or at least i did!
Wonderful detail and texture -- you must have a great camera to get this much sharpness with such a detailed subject. My only caveat is that, while this would make a wonderful piece of art hanging on a wall, I'm not so sure how great of a desktop it makes mainly because of the subject matter.