Its something that require PHP to fetch the data and the data needs to be exposed to the specific controller related to the page you are viewing. I can't remember if I created a [bd] WF renderer for this or not, but that would be one way. The other way would be to create a phpCallBack block that you could place in any template. There are how to's on XF.com that explain the basics of creating a phpCallBack block (you could then use the code from the Showcase Controller that fetches the Tag Cloud data and you can reuse the tag cloud template (located in the index sidebar template). If you like LEARNING, this would be a decent starting point.
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