I have a hard time believing it. If you do a quick google search for "Osama Bin Laden Dead" you see articles from 2005 to 2009 saying the same thing in different regards. Including one that claims he has been dead for 7 years. I will wait for an official announcement before getting too excited about it.
If so, then good riddance.
Maybe, but every major news organization is reporting on it and apparently Obama is going to talk about it. If it's a hoax, this will have major, major backfire.