While Google, Microsoft, News Corp., and AOL fight to get a piece of Yahoo, the target's internal turf wars are turning ever more vicious. It's a lovely side effect — for us, at any rate. The latest slagfest hit Yahoo VP David Pann, whom our tipster describes as having been in charge of "Panama marketplace optimization" — tweaking the sale and placement of ads to make them more profitable. But no longer. Our tipster says Pann has been "shunted off to a quiet corner" and replaced by "his archrival," VP Mark Morrissey, pictured. Pann's already had his revenge, however.