If you want to get more information about the 2012 Doomsday Hoax, then the best source is David Morrison. If you are a member of the ASP then you probably saw his article in Astronomy Beat or you know how to find it. If you are not a member, this link will help. http://www.csicop.org/si/show/myth_of_nibiru_and_the_end_of_the_world_in_2012/
This film clip of Neil deGrasse Tyson is wonderful. http://fora.tv/2009/02/04/Neil_deGrasse_Tyson_Plu-to_Files#Neil_deGrasse_Tyson_World_Will_Not_End_in_2012
Dr. Phil Plait has more info on the whole Nibiru cult. http://www.badastronomy.com/bad/misc/planetx/
If you know someone truly confused by data from the IRAS satellite that “showed” a tenth planet, please point them to http://spider.ipac.caltech.edu/staff/tchester/iras/no_tenth_planet_yet.htm