Tag clouds have never been particularly useful… they give ‘at a glance’ view of the content of a website, but they have very little potential for wayfinding… try even finding the link to your own bookmarks in a Del.icio.us tag cloud – presenting categories and subcategories is more effective.
According to a recent research study by Razorfish, 65% of the people never use tag clouds, and 23% use them ‘once in a while’.
Digital Consumer Behavior Studyhttp://www.avenuea-razorfish.com/reports/DigConsStudy.pdf
Wordle tries to create more useful word clouds… it’s a pity you can’t actually embed it into your website.