The article you have requested is not available on the AAAS Project 2061 Web site. Below is reference information for the article and information on how to view the article or obtain reprints if available.
Sumner, T., Ahmad, F., Bhushan, S., Gu, Q., Molina, F., Willard, S., Wright, M., Davis, L., Janée, G. 2004. A Web Service Interface for Creating Concept Browsing Interfaces. D-Lib Magazine, 10 (11).
Available on the D-Lib Web site at http://www.dlib.org/dlib/november04/sumner/11sumner.html.