According to this lame article from News.com, calendaring is the next important feature for the portals to implement. The article talks about the “treasure trove of detailed personal information” available to the portals from the calendars. Do I really want to post dates in my calendar if someone is going to filter through them and use the information to try to sell me more crap? Give me a break. That kind of makes you wonder what the free email services are doing with your email messages.