There was an unusual amount of turnover among sector-leading stocks Friday, as the market ended a solid week with moderate gains in soft trade. LED chipmaker Cree (CREE) and Gulf Resources (GFRE), a China-based chemicals maker, jumped onto the list. Baidu.com (BIDU), Lululemon Athletica (LULU) and Higher One Holdings (ONE) all blinked off. Most sector leaders posted gains for the day. All but one moved in lower or inconsiderable volume. The