source: http://news.bbc.co.uk/1/hi/world/south_asia/1648572.stm
Anyway, I think it is improbable that Al Quaeda uses Nukes or chemical weapons. I thinks this kind of weaponry would cost him too many sympathies in the Muslim world and an organisation like his is too heavily reliant on the support.
I agree with this. On the other hand the majority of the Muslim world think the Jews in collaboration with Bush were responsible for 9/11. Osamas Hiroshima reference has meaning though. I have always thougt it is a means to pave the way and justify a nuclear first strike if he ever decides conditions are ripe and he can get away with it.
I don't think it would cost him anything in the Muslim world at all. If it tipped one way or the other, he would probably gain a little support.
If OBL had nukes he would use them. Muslims would be dancing in the streets, again. He would not lose support, but gain many more adherents.