Tonight is the debut of the NCAA Basketball tournament under the new TV contract. CBS made a deal last year with Turner Sports to split the 68 games scheduled among four channels. This year will see truTV, TBS and TNT join CBS to air all 68 games without interruption.
truTV will air The First Four tonight and Wednesday.
NY Times has an article about this big change in TV coverage:
http://www.nytimes.com/2011/03/16/sports/ncaabasketball/16tourneytv.html?_r=1&src=twrhp