[rmc]

"Sweden has not charged Assange with anything."

Technically no, but that's more with how the Swedish system works. In the High Court appeal to the extradition, the judge ruled that "there can be no doubt that if what Mr Assange had done had been done in England and Wales, he would have been charged" (§153 of http://www.bailii.org/ew/cases/EWHC/Admin/2011/2849.html). So he it is the opinion of the English courts that has been the equivalent of "charged".