Users have very different opinions when it comes to tag clouds. Some like them, some can't stand to look at the mess. Whatever your feelings are, categorizing items (i.e. blog posts) using tags have become very popular and widely spread and can't be
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J. Mueller, S. Doerfel, M. Becker, A. Hotho, and G. Stumme. Recommender Systems and the Social Web Workshop at 7th ACM Conference on Recommender Systems, RecSys 2013, Hong Kong, China -- October 12-16, 2013. Proceedings, 1066, Aachen, Germany, CEUR-WS, (2013)
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M. Kubatz, F. Gedikli, and D. Jannach. E-Commerce and Web Technologies, volume 85 of Lecture Notes in Business Information Processing, Springer Berlin Heidelberg, (2011)