Just FYI, but the <Meta="keywords"> tag is virtually useless for helping you rank better. Most search engines ignore the information due to people using it for keyword stuffing. Personally, I've wondered why All-in-one-SEO continues to include it.
Tags appear on your site and with the rel="tag" attribute. Sites like Technorati surf blogs to find the rel="tag" links to index the information and help searchers find what they're looking for.
For a better explanation check out this article:
http://lorelle.wordpress.com/2006/03...s-versus-tags/
Lorelle also has some other great articles about utilizing tags that you may want to look for.