yup, as an add-on to the above post, re: baby showers, the baby shower thing is not well received over here as we generally don't make presents to the baby until its safely born. Its again a difference in culture.
I think the US is a little more outgoing/flamboyant than us Brits, We are a little more cautious, reserved and introverted in our general outlook on life. (generally speaking, though the way some of us act abroad when they think they are out of this social norm is appalling!)
Stephen Fry summed it up for me. He said in the US, people say the Phrase "Only in America!!" to mean a statement of praise for the country, that opportunities abound. In the UK, people say, "Only in the UK!" to mean a roll of the eyes statement that the system has let us down again, and that something stupid has happened.