WordPress Tag Cloud font sizes

Interested in adding the tags used in your blog but also display them in different font sizes ranging from least used to most used? Below is a PHP script you can use to display all the tags and a few different values you can change.
<?php wp_tag_cloud('smallest=8&largest=12&number=25&orderby=name&format=flat'); ?>
Using a tag cloud is great for the visitor to search your blog based on tags also great for search engines to bring up your website when one of your tags is relevant to the search engines query.