CBS is the latest network to preview its fall primetime lineup online, on demand and free - via Google Video.

Commercial-free episodes of Smith, The Class, and The New Adventures of Old Christine will be available online September 13-17, writes MediaWeek. CBS has not said whether the series will be sold via Google Video after their TV premiere. Google now sells full episodes of CBS shows such as CSI and Survivor for $1.99 each.

The pilot episode of The Class will also be available to TiVo subscribers prior to its on-air debut. CBS last month announced that it would be showing its most popular primetime programs on its Innertube broadband channel.

Earlier this week, AOL began streaming the pilot episode of NBC's Studio 60 on the Sunset Strip, and CW announced plans to stream episodes of several of its returning shows on MSN.