The Economist Style guide has a great section on Americanisms, thanks to Rani for pointing me to the link.
In a dry, British fashion they analyze the American use of the English language.
Some nice quotes:
Other Americanisms are euphemistic or obscure (so avoid affirmative action, rookies, end runs, stand-offs, point men, ball games and almost all other American sporting terms).
Put adverbs where you would put them in normal speech, which is usually after the verb (not before it, which usually is where Americans put them).
Cricket is a game not a sport. London is the country‘s capital, not the nation‘s.
In Britain, though cattle and pigs may be raised, children are (or should be) brought up.
Gubernatorial is an ugly word that can almost always be avoided.
Grow a beard or a tomato but not a company. By all means call for a record profit if you wish to exhort the workers, but not if you merely predict one. And do not post it if it has been achieved. If it has not, look for someone new to head the company, not to head it up.
You may program a computer but in all other contexts the word is programme.
Vilest of all is the habit of throwing together several nouns into one ghastly adjectival reticule: Texas millionaire real-estate developer and failed thrift entrepreneur Hiram Turnipseed…
Read the original link to be amused.