I think the part where the US tried to pawn off their Guantanamo Bay prisoners in such a way that they can not challenge their YEARS of illegal detention was one of the more damning bits.
That's one set of crimes (and the rendition flights) that is going to take a long long time to wash away.
- The US spied on the UN, including credit card numbers and frequent flying numbers of its leaders.
- The US wrote Spanish new IP law.
- The US pressured Spain not investigate the killing of a Spanish journalist in Baghdad by US forces.
The leak degrades the image of the US government, but not as much as it degrades the images of almost any other government (at least so far).