Show me the bull of that. I think you are referring to the two patriarchs, Constantinople and Rome, excommunicating each other, in 1054. But those bulls have been lifted during the 20th century, and were ONLY applied to those two specific men. Your polemics are incorrect, the Orthodox do not consider Benedict XVI a heretic...
Regards
A heretic is one who holds a heretcal beleif.
The notion that the pope is the head of the church and not Christ is heretical to the orthodox doctrine.
Do the math.
(The Orthodox actually use heretical and Apostasy quite often...)
http://www.orthodoxwiki.org/Roman_Catholic_Church
http://www.orthodoxwiki.org/Heresy
Interesting link regarding the Orthodox perception of the Bishop of Rome:
http://www.thechristianactivist.com/Vol%207/V7F2000.htm