Nate Davis, former XO Communications' president/COO, joins XM Satellite Radio as president/COO. Hugh Panero continues as CEO. Also at XM Steve Cook, its sales and marketing VP, named automotive executive VP, a new post. My-Chau Nguyen, ex-Sprint Nextel, joins XM as marketing senior VP for planning and research, and Sean Connolly, ex-Intel, joins XM as brand management and media VP... David Barnes, RadioShack's executive VP/chief financial officer has resigned from his position and James Gooch has been named as his replacement. Also at RadioShack, former national accounts sales manager Scott Meyer becomes the chain's VP/DMM for A/V products… Bruce Youmans, a 20 year veteran of TDK Electronics and its marketing VP, named product research and development VP, a new post. Replacing him is Lou Magarelli, who was most recently Fuji Photo Film USA's sales VP for commercial markets ... K.I Kwon, digital display division VP for LG Electronics in North America, named president of its USA consumer electronics division, succeeding J.M. Lee who is leading the company's mobile phone operations in Russia and neighboring countries ... Cary Christie, owner of Artison and Infinity co-founder, named to the board of music download site MusicGiants ... Anthony Bruno, ex-Maytag, joins premium majap distributor Eastern Marketing in an as yet unnamed position… Sean Hicks has returned to his role as president of Warrantech's consumer product services division following a five-year absence from the extended service contract provider ... John F. Homlish, ex-sales VP with Samsung, joins Casio as sales and marketing executive VP.... Bob Goodman, marketing and sales VP at Massive Audio, joins Myron & Davis as national sales manager, a new post ... David Graeberger, who co-founded BG with Wisdom Audio founder and CEO Tom Bohlender in the early 1990s, joins Wisdom Audio as senior technical advisor and member of its advisory board ... David Naranjo, ex-DisplaySearch consumer electronics research VP, named product development director of Mitsubishi Digital Electronics.