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Many Happy Returns: A Parent's Guide

New characters! New episodes! New seasons! Check out our helpful guide to our favorite returning kids shows on broadcast, cable and satellite. PreschoolFirst up, Sesame Street (PBS) celebrates the start of Season 37 next week by adding the magical Abby Cadabby, a delightful (if mistake-prone) sprite who represents the first new female Sesame Muppet in more than 13 years. [Look for a TVGuide.com Insider Q&A with Abby on Monday, Aug. 14.] Barney & Friends (Sept. 15, PBS) also waited 13 years to introduce Riff, their new dino character, whose musical imagination helps usher in an era of more varied tunes. New playmates will also populate the worlds of