Mac users will be able to watch all the CBS-broadcast games for free on CBSSports.com. Games aired on TBS, TNT and TruTV will be available to authenticated watchers of certain pay-tv providers.
For iPad and iPhone viewers, everyone will be required to make a $3.99 in-app purchase to watch all 67 games via Wi-Fi or 3G. That fee covers all devices as well, so paying customers watching games on their Macs won't have to worry about authentication.
The NCAA March Madness app is free for iPhone and iPad, plus the $3.99 in-app purchase to actually watch the games [Direct Link]. The Big Dance begins March 13.