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Michael Carroll, a twenty-year veteran of technology publisher IDG who served as SVP and group publisher of both PC World and Macworld, has resigned, according to a source. The departure comes after a round of layoffs, the departure from PC World of Editor-in-Chief Harry McCracken and, our source says, considerable churn in the executive ranks:

CEO Mike Kisseberth has eliminated a number of senior managers in the last three months, including the publisher of Macworld, director of consumer marketing for PC World, and the senior director of marketing for PC World.

Carroll was promoted to the position in April 2007, shortly before CNET veteran Kisseberth replaced IDG CEO Bob Carrigan, who was serving as acting CEO of the PC World/Macworld group. Hopefully Carroll won't take too much of the advertising business for the magazines that he oversaw with him.