Here are some “debunkers” for you:
http://www.examiner.com/astronomy-in-aurora-co/comet-elenin-boom-to-bust
http://mara-gamiel.blogspot.com/2011/02/coming-of-comet-elenin.html
Hmmm... It was a little bit bright last year, this year it will be brighter (closer). Next year around Dec 21st, I expect it to have a big impact. ;^)