I believe it would be also useful if campaign managers would visit this thread from time to time. In case actmyname or Igebotz can't update their lists too often, managers can get their material directly from this thread.
Anyone that needs to interact with many users would find it useful to maintain their own personal lists beyond using others. External sources can be outdated, lacking in scope, arbitrary, and have a number of possible issues.
Plus it's decentralization and all that jazz.