That means now is the time to make sure your computer/browser/software are ready to deliver all the action. Visit the March Madness on Demand site to get what you need (software downloads are free), to see the brackets take shape, and to revisit video of previous seasons' highlights.

Broadband connection speeds are definitely necessary to take it all in, especially if you want to use MMOD's new High Quality player with better video and one-click access to bracket updates. (The site will let you know if your browser/computer can handle it.)

Other MMOD goodies now hook into Facebook, your own website, and update widgets. Got an iPhone? You can watch there, too.

Last year's March Madness on Demand drew almost 5 million unique users online, while this year's is expected to lure more than 7 million. It's turning into a major demonstration of live online viewing power, and a big building block for CBSSports.com as it seeks to become a gateway destination for sports online.

But what about sports on good old TV? March Madness reigns supreme there, too, with five dozen games set to be seen on both CBS and ESPN.