The Chronicle, whose editorial page editor once lectured bloggers on the superiority of editorial pages in their ideal state, let slip this little error in copy earlier this week in a pro-green editorial:
The U.S. Conference of Mayors passed a resolution backing a 12-step program for cities to meet or beat emissions goals set by the Kyoto Protocol — the internationally climate change treaty rejected by the United States.
The bolded error made it into print editions as well.
Presumably, this is not an example of an editorial in its ideal state.