Amazon.com announced that its "Unbox" digital video service now offers downloads ($1.99/ep) of Showtime programming. Available series include "The L Word" and "Weeds." Amazon is also through Oct 25 promoting the pilot of "Dexter" with a 1 cent download fee. — CBS and YouTube announced the launch of CBS Brand Channel at http://www.youtube.com/cbs. The initial run of broadband video content includes clips from "Late Show with Dave Letterman" and "CBS News First Look with Katie Couric," and archival footage from the NCAA basketball tourney.