Hitwise is now reporting that Google Calendar has increased its marketshare 333% from the period of June 2006 to December 2006, or roughtly a 6 month period. This phenomenal growth has already pushed Google ahead of MSN Calendar in market share, and is quickly catching up to Yahoo. A Hitwise rep. believes that if Google promotes its calendar service a little bit more, they will be able to surpass Yahoo Calendar's market share.