There is a lot of talk in the Catholic Church about the upcoming new Missal, which will be released at the beginning of the next Liturgical Year (Advent 2011). One of the key changes is the congregations response to the celebrant before the thanksgiving prayer over the bread and wine; where he says "the Lord be with you" we will respond "and with your spirit".
As an Anglican convert, this language is very familiar to me. However, I found it to be an interesting debate amongst Catholics of why the Church is going back to this language. Some are even suggesting that the Church is trying to return to ways before the Second Vatican Council (which I find humorous).
I found an interesting article that explains the origins of this statement and why we in the United States will soon be saying " And with your Spirit".