There is too much wishful thinking going on around Stuxnet, both on the part of the security industry and the general public who'd rather believe their own country originated it. If you were a world super power, wouldn't it be in your interests to claim responsibility for a first of its kind, extremely high tech attack? I believe any government wouldn't mind this kind of attribution.

I'll wait my 50 years or whatever for the relevant documents to be declassified, in the meantime this is all just drama and guesswork, no matter how many anonymous, totally reliable sources crawl out of the woodwork.