This was just mentioned on the Bill Press Show.   It's not just bloggers changing their nicks anymore, now dedicated Obama supporters are going to court to legally change their middle name to Hussein, or to add it as an additional middle name.

backup copy of the link, in case it doesn't take:
http://www.nytimes.com/2008/06/29/us/politics/29hussein.html?_r=1&oref=slogin