Author and Mac Design Magazine Editor-in-chief Scott Kelby will be a featured guest at Apple’s SoHo store in New York City this coming Monday, July 14 from 7:00 to 9:00 PM ET. Kelby, the author of the best-selling books “Mac OS X Killer Tips” and “Photoshop Down & Dirty Tricks,” will reveal the secrets behind some of his favorite OS X speed tips and Photoshop special effects. In addition, Kelby will also give away several free copies of his books.