BritSpeak: English as a Second Language for Americans
http://pages.prodigy.com/NY/NYC/britspk/main.html
Have you ever heard anyone say, "I'll knock you up tomorrow morning"? This statement would be shocking only if you didn't realize that, to the British, the term knock up means to awaken someone by knocking on that person's door. This site attempts to clear up many such opportunities for misunderstanding, and provides a dictionary that converts British words and phrases to American and vice versa.