Kelly Clark, of West Dover, heads to Vancouver after  a successful season in halfpipe punctuated with a silver medal in the 2010 X Games. The 2002 Olympic Champion  struggled during the 2006 Games,  finishing just off the podium in fourth. This year she’ll be looking for more. She won a Grand Prix at Park City, and took both wins in Mammoth, Calif., and the opener at Copper, Colo.