ZoomClouds offers a fuss-free way of incorporating a tag cloud into your blog/site.
Here's the tag cloud for this site based on entries for the year:
Warning: include() [function.include]: http:// wrapper is disabled in the server configuration by allow_url_include=0 in /home/simplifier/www/www/mt/archives/2006/03/diy-tag-cloud.php on line 87
Warning: include(http://www.simplifierlab.com/includes/tagcloud.php) [function.include]: failed to open stream: no suitable wrapper could be found in /home/simplifier/www/www/mt/archives/2006/03/diy-tag-cloud.php on line 87
Warning: include() [function.include]: Failed opening 'http://www.simplifierlab.com/includes/tagcloud.php' for inclusion (include_path='.:/usr/local/php53/lib/php') in /home/simplifier/www/www/mt/archives/2006/03/diy-tag-cloud.php on line 87