Bringing the board sport lifestyle to inland mall-goers has been a fundamental strength in the growth of Pacific Sunwear (Nasdaq:PSUN - news) stores. Now is bringing its surf, skate and snowboard lifestyle flavor to sites throughout the Internet with the launch of a new affiliate program. Less than a year old, is already capitalizing on the large potential for online apparel sales and a fast-growing teen Internet shopping audience. Industry analysts project this category to grow beyond $6 billion in sales by 2003. "As an extension of our popular brick and mortar operation,