For better or for worse, it looks like Carl Icahn has cut some ties to Yahoo. The activist investor, who once bought a great many shares as part of an effort to force out Jerry Yang and Yahoo's board of directors, reduced his stake by about 80.2 percent during the last six months. SEC filings reveal that Icahn owned a whopping 60,452,099 shares of Yahoo's stock as of August 14th, 2009. By the time February 12th rolled around,