I am withdrawing the bug report which I submitted in my last post. Why this confusion:
1. How Cloud Tags works : I digg into mysql table and found that the tags which consist of max. number of same word will automatically get higher points. So if you have "pligg" tags entered 4 times in diffrent story then the font will be bigger and if you have "digg" word entered 2 times, the word will be little smaller and so on. Previously I have diffrent cloud tags for diffrent stories. Actually I expected that the Cloud Tags should Change point based on number of Clicks on the Tags or based on Search Words ?
2. Template modification: I did a little modification in both:
tag_cloud_center.tpl and sidebar_modules/tags.tpl file. What I did is moved style="font-size: {$tag_size[customer]}pt" from <SPAN> to <A> tag. For some, in <SPAN> it will work but for safer side, I think its better to put font-size into <A> tag because people tend to put Style into Anchor in the CSS and which will make anchor to get the parents property.