I puzzled over this in the evening sky the other night, without knowing what I was looking at (wrong place and time for Venus, too bright for Mercury, too still for an airplane…)
This is the first article I've read on it; apologies if it's old news.
http://seattletimes.nwsource.com/html/localnews/2003519521_comet11m0.html
Time to get out and get watching–right around sunset.