Jon Stewart and Stephen Colbert are Nos. 3 and 4 on the list of 32 who have been called upon to give testimony as YouTube fights a $1 billion lawsuit by Viacom.... The season premiere of FX's It's Always Sunny in Philadelphia will be streamed on the show's MySpace page starting Thursday, a month before its on-air broadcast.... ABC is producing music videos, 11 in all, to promote many of its fall shows and the artists whose songs are used on them. Among the pairings will be Ugly Betty and Mika's "Big Girl" refashioned as "Betty Girl," available Thursday at ABC.com.... Al Gore's Current TV cabler has launched a music blog called The Daily Fix.