Jason Kottke's got more information on the Zidane situation (and commentary). Two main UK newspapers hired lip readers to decode what Materazzi said that triggered Zidane's glabrous rage. The papers claim that the Italian player said:
Hold on, wait, that one's not for a nigger like you.We all know you are the son of a terrorist whore.
So just fuck off.
Wow. So it appears that Materazzi might have talked about Zidane's mama as I previously guessed. Of course, this is still not a concrete fact, so everything is still pure speculation.