The amount seems to shrink each year. Not because my friends disown me and take me out of their address book, but rather because more and more people decide not to send cards every year. They blame it on the price of postage, lack of time, or more often then not, sites like Facebook that keep you in touch with family and friends all year long.
Christmas cards are falling to the wayside much like personal letters are. To me there are no replacements for either. There is nothing like a letter written to you by a friend and nothing like a stack of Christmas cards arriving in December with family photos, newlsetters, and notes. It is like the magic touch - holiday greetings and a warm hug wrapped up in one.