As you may remember, CBS's president of digital media Larry Kramer announced back in February his network's intention to sell downloadable episodes of Survivor - without iTunes. For $1.99US, you got a single episode that expired in 24 hours. He stated that CBS would be moving gradually into this new media frontier.
Today, they've taken what I think is a nice step forward. Survivor, Numb3rs and all three CSI's are now in the US iTunes Music Store [iTunes link]. Welcome to the party, CBS!