This is a tiny, lightweight plugin I wrote to use the new native tagging from WordPress 2.3+ to automatically create a meta-keyword-tag for my blog.
The plugin adds a meta-tag to the html-header-part of your blog. This meta-tag contains keywords that describe the contents of the html-page. Adding this kind of meta-tag is one part of the job of optimizing your blog for search engines. To learn more about search engine optimization, I recommend reading and understanding these articles: