If you want to create a Taxonomy Tag Cloud in Drupal, Tagadelic is a very good module which could serve your purpose.
After you have enabled the module, you could find some new blocks which are named as Tags in [VOCABULARY NAME]. Enable the block and your tag cloud is ready.
You could modify the Tagadelic settings such as the sorting order and the number of tag cloud levels @ admin/config/content/tagadelic
Done =)
Reference: Drupal Module – Tagadelic
Eureka! 
is this really a drupal 7 module though? I only see a dev version..
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I did use the dev version for a D7 site. it should work without big problem. Worth to try it. =)
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not helping.. need more detail
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what problem did u hv?
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i enabled tagadelic module but there all the same font size and doesn’t work only appear the tags
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The font size of the tag depends on the number of content being tagged. Try tagging more and there should be difference on the font size.
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