The TV Zone

ABC has named David Muir anchor of "World News Saturday" and a co-anchor of "Primetime." Why is this interesting? Well, in part because the "WNS" job was formerly held by Bob Woodruff, and these jobs can be (as Woodruff proved) stepping stones to bigger things. Muir's a relative fast-riser at ABC: Joined as anchor of "World News this Morning" in '03, and has been lead reporter on several major stories, including the Israeli war with Hezbollah.