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With more than 120 million blogs in existence, how do people find YOUR content on the Internet? The key starts with great search engine optimization (SEO), which is an art and a science that helps search engines discover your content and understand how relevant it is to specific search queries.

You can blog your heart out, but if you don’t have good SEO, then odds are you won’t have many readers.  Luckily, the WordPress () plugin community values SEO and has developed a number of plugins to help. Here are 20 of the best SEO plugins to help you choose the right tags, tell search robots what to work on, optimize your post titles and more.

Have another SEO plugin to recommend? Tell us more about it in the comments.

All in One SEO Pack – One of the most popular plugins ever for WordPress, this plugin does a bit of everything for you from helping choose the best post title and keywords, to helping you avoid duplicate content and more.

Automatic SEO Links – Automatic SEO Links allows you to choose a word or phrase for automatic linking, both internal and external, set anchor text, choose if it should be “nofollow” or not, and more.  One of the best features of this plugin is that it will only do this for the first occurrence of a word in a post so you don’t have to worry about spamming your post with numerous links to the same thing.

Google XML Sitemaps – An essential tool in any blogger’s armory of SEO tools.  While the name only mentions “Google (),” this plugin creates an XML-sitemap that can be read by Ask, MSN and Yahoo also.

HeadSpace2 – This plugin allows you to install all sorts of meta-data, add specific JavaScript and CSS to pages, suggests tags for your posts and a whole lot more.

Meta Robots WordPress plugin – An easy solution for adding robot metadata to any page you choose on your blog.  You can use it to make your front page links into “nofollows,” prevent indexing of search pages, disable author and date-based archives, prevent indexing of your login page and numerous other features.

Nofollow Case by Case – This plugin allows you to strip the “nofollow” command from your comments, and then you can apply it to only the comments you don’t wish to support.

Platinum SEO Plugin – The Platinum SEO Plugin offers you such features as automatic 301 redirects for permalink changes, auto-generation of META tags, post slug optimization, help in avoiding duplicate content and a host of other features.

Redirection – For any number of reasons you sometimes need to move a page from one spot on your blog to another, but then you risk losing that page’s status in search results.  Redirection helps you with your 301 redirects, captures a log of 404s so you can work on correcting them, sets up an RSS feed for errors and more.

SEO Blogroll – Do you worry that the people you link to in your blogroll are feeding off of your PageRank?  With SEO Blogroll you can make separate sections for various groupings of links, with an unlimited number in each, and all of them will receive the “nofollow” attribute.

SEO for Paged Comments – With the introduction of paged comments in WordPress 2.7, there was a potential problem with search engines thinking you had duplicate content as the post would appear on each page.  This plugin aims to take care of this issue for you until the folks at WordPress change things up.