Scott Kelby, best-selling author and editor-in-chief of Mac Design Magazine, will be at the Chicago Apple Store on North Michigan Ave. at 4:00 p.m. on Sunday, May 30 for a book signing and live demonstration of Photoshop and Mac OS X tips. Kelby is promoting his two latest releases, “Mac OS X Conversion Kit, Panther Edition” and “Mac OS X Killer Tips,” and presenting tips and tricks from “The Photoshop CS Book for Digital Photographers.” Kelby remains in the Chicago area to host and lecture at the second annual Mac Design Conference & Expo, which takes place June 2-3 at the Donald E. Stephens Convention Center. Free passes to the Mac Design Expo will be handed out during the book signing (valued at US$40).