If you get an e-mail forwarded to you with a quote from Colin Powell to the Archbishop of Canterbury, know that it is almost accurate.
According to Urbanlegends.About.com:

Although U.S. Secretary of State Colin Powell did utter words similar to the above, he was not in England at the time, nor was he addressing the current Archbishop of Canterbury, nor was he responding to a question about “empire building.”

Just so you know, ya know?