This is in the wallpapers section, but here's a higher res version without the logo:
That was taken just before the 2006 Thanksgiving game vs. the Broncos that was the inaugural Thursday Night Football game for NFL Network. My wife (fiancee at the time) is a Broncos fan and had never been to Arrowhead before. From what I can tell, that game was the last time that Arrowhead was truly rocking. Plummer just couldn't handle it, and it was his last game on the field for the Broncos IIRC. It was a truly awesome experience, and she left finally understanding what it is about Arrowhead that made me so obsessive about the Chiefs.