Yahoo! Buzz Game is a fantasy stock market that lets people predict the technologies, products, and concepts that people will be searching for in the future. The game consists of many markets like "linux distributions" or "java development environments".
Some upcoming Google products are trading in the "Rumors Mill" market. Those products include Google Calendar (GOOGCAL) and Google Payments (GOOGMON).
You can see that Google Payments shares are trading at $13.47 at the moment. The shares fluctuated from about $6.5 to $14.0 in the last year of trading. The buzz index moves up and down according to searching activity for the word "google payments" and other related terms like 'google wallet' and 'google paypal'.
If you're interested in this, you might also be interested in Alexadex, a fantasy stock market where people can buy and sell shares of websites.