Sunday's Washington Post travel section had an article comparing results from different map sites. Among the findings:

It was time for an easier test. Could the Big Five get us from Reagan National Airport to the White House? Surely, we thought, the Internet's biggest and best could locate the nation's most famous address. We started with MapQuest, entering "Reagan National Airport" and "1600 Pennsylvania Avenue." Up popped the response: "Unable to find 1600 Pennsylvania Ave."

Mapquest.com has since fixed this bug.