Torrance, Calif.-based Frenzi.com launched an application for enabling e-marketplaces to let their customers trade answers to business questions. Frenzi Knowledge Exchange is a hosted application that seamlessly integrates with a Web site's existing look and feel. It lets users post questions that they are willing to pay other people in the community to answer. Q&A Web apps seem to be booming. Others in the field include Question.com and Answers.com.