The 10 most powerful companies in networkingInnovative. Acquisitive. Assertive. Influential. Our 2002 picks continue to push the technological edge. Not even a prolonged down economy can stop their power moves.Powerometer 2002: Company readingA big dipIn our annual survey, readers rate no vendor more powerful this year than last. But they remain optimistic that new technologies will help the industry regain its former luster.