TagCloud is an automated Folksonomy tool. Essentially, TagCloud searches any number of RSS feeds you specify, extracts keywords from the content and lists them according to prevalence within the RSS feeds. Clicking on the tag's link will display a list of all the article abstracts associated with that keyword.
R. Abbasi, S. Chernov, W. Nejdl, R. Paiu, and S. Staab. Advances in Information Retrieval, volume 5478 of Lecture Notes in Computer Science, page 654--661. Springer Berlin / Heidelberg, (2009)
F. Abel, N. Henze, and D. Krause. Proceedings of the 17th ACM Conference on Information and Knowledge Management, CIKM 2008, Napa Valley, California, USA, October 26-30, 2008, page 1429-1430. ACM, (2008)