Comment Would make a nice Astronomy Picture of the Day (Score 1) 100
http://www.skyandtelescope.com/community/skyblog/observingblog/A-Dream-Comet-Heading-Our-Way-171521041.html
An added bonus is that the comet passes very close to Mars in early October 2013 and could potentially be observed by the sensitive Mast Cameras on the rover Curiosity.