New Web-based technologies and service offerings are allowing online companies to add in what's always been the core of customer service: the human touch. The improvement of customer service is becoming a critical factor in determining the success of vendors in the crowded Internet-based electronic commerce market. The effort is necessitated by the fact that 30% of all e-commerce transactions begun are not completed, resulting in a significant loss of revenue. Many Web sites offer shoppers automated help, such as self-guides and e-mail, but an April survey by Jupiter found that many online