LogCloud provides a shortcode that generates a tag cloud with logarithm scaled font sizes.
LogCloud displays a tag cloud much like the built-in WordPress tag cloud, except that instead
of scaling the font sizes linearly, the sizes are scaled using a logarithm scale.
If you use your tags with approximately equal frequency, the normal linear scale works just
fine. However, if you tag your posts such that just a few tags predominate, the linear scale
results in one or two very large looking tags in your cloud, and everything else will use a
couple of font sizes at the lower end of the scale. A log scale cloud will result in a more
even distribution for this situation.
initial version; cut-and-paste of wp_tag_cloud with log scaling replacing linear scaling and using a shortcode
added min_usage argument
added scaling by color
fixed a divide by zero bug