The Frankie Roberto Zeitgeist
If there's a bandwagon, jump on it. With this idea in mind, I've joined the increasing number of websites offering a cool textual representation of most-used tags/keywords. Check out my Tag Zeitgeist.
To create this, I used Moveable Type to create an XML list of tags, (using the <MTCategory> template tags), including the count of number of blogs in that category. Then, the XSLT stylesheet takes this data and only outputs the tags with more than one entry (<xsl:if test="(@count > 1)">) and gives them a font size equal to the entry count divided by three plus ten (<xsl:value-of select="round(@count div 3 + 12)"/>). Not altogether too simple, but feel free to steal the code if you want.