WordPress has a pretty useful wp_tag_cloud function that generates a cloud (or list)  of tags used on your website. I use it on the current index page.

You might not be aware of the number parameter, and its default setting. If you don’t specify a number the function will return a maximum of 45 tags.

Simply set the number parameter to 0 to display all your tags. Here’s how I use the function:

<?php wp_tag_cloud('smallest=0.915&largest=0.915&unit=em&format=list&number=0'); ?>