Thank you for your nice reaction!!! I tested it and if you see my attached file I think the problem is the generating of the "popularity" algorithm, you suggest, because all the tags, has the same style. Do you know how this algorithme works. Is there a problem with security to save a tag click or something. Is it saved in the database? I can't figgure it out.
The people who are in charge of the blog module aren't probably reading this so I'll speak on their behalf.
If you haven't already please raise it as a bug on open.silverstripe.org. Optionally also email the module maintainers directly to get a rely. By making it on open it will be assigned a developer to look at. Looks like the tag rating needs to be weighted a bit better.
I don't think this is a bug. I do not know how the tag cloud works but it does not seem to be random... it must be based on how many times the tag is mentioned. So because of this when you first start posting all of your tags are mentioned the same amount of times it can't give different ratings for them so they have to start off with the same rating. So now that I have started using my blog and posted up 30+ posts the tags are starting to change and it appears to be that the ones mentioned more are "popular" and the others have gone down to "somewhat-popular"...