Usually the protesters just light the American flag on fire. Burning the embassy is a more refined art. I don't remember the last time an American embassy was burned down, but I seem to remember a few of them back in the late 70s.
I guess we can at least rest easy that the little respite in America-hating is over and things are reverting to normal.
To be honest, I'm not sure why the Bush Administration felt such a need to recognize Kosovo. A little time wouldn't have been inappropriate.