Google XML Sitemaps

This plugin will create a Google sitemaps compliant XML-Sitemap of your WordPress blog. It supports all of the WordPress generated pages as well as custom ones. Everytime you edit or create a post, your sitemap is updated and all major search engines that support the sitemap protocol, like ASK.com, Google, MSN Search and YAHOO, are notified about the update.

http://www.arnebrachhold.de/projects/wordpress-plugins/google-xml-sitemaps-generator/

All in One SEO Pack

Optimizes your Wordpress blog for Search Engines (Search Engine Optimization).

Some features:

• Automatically optimizes your titles for search engines
• Generates META tags automatically
• Avoids the typical duplicate content found on Wordpress blogs
• For Wordpress 2.3 you don’t even have to look at the options, it works out-of-the-box. Just install.
• You can override any title and set any META description and any META keywords you want.
• You can fine-tune everything

http://wordpress.org/extend/plugins/all-in-one-seo-pack/

HeadSpace2

HeadSpace2 is an all-in-one meta-data manager that allows you to fine-tune the SEO potential of your site. Visit the HeadSpace page for a video demonstration.

http://wordpress.org/extend/plugins/headspace2/

SEO Smart Links

SEO Smart Links can automatically link keywords and phrases in your posts and comments with corresponding posts, pages, categories and tags on your blog.
Further SEO Smart links allows you to set up your own keywords and set of matching URLs.
Finally SEO Smart links allows you to set nofollow attribute and open links in new window.
Everything happens completely transparent, and you can edit the options from the administration settings panel.

http://wordpress.org/extend/plugins/seo-automatic-links/

SEO Friendly Images

SEO Friendly Images is a Wordpress optimization plugin which automatically updates all images with proper ALT and TITLE attributes. If your images do not have ALT and TITLE already set, SEO Friendly Images will add them according the options you set. Additionally this makes the post W3C/xHTML valid as well.

ALT attribute is important part of search engine optimization. It describes your image to search engine and when a user searches for a certain image this is a key determining factor for a match.

TITLE attribute play lesser role but is important for visitors as this text will automatically appear in the tooltip when mouse is over the image.

http://wordpress.org/extend/plugins/seo-image/

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