Every year, Google introduces interesting new products and services. Inevitably people will use some of those products. Google introduces them because they believe these products will add value to their current offerings, and they are correct. Inevitably some of these products will become beloved by many, many people. Then one day google announces that the service you know and love is going away.
Sometimes they replace it, sometimes they don't, but without fail it is never quite the same.
This is the Google Graveyard: A home for news and information about the products google has killed, or will kill (unless google kills the products that I am using to create this site).