Wordpress Plugins

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SEO by Yoast

http://wordpress.org/extend/plugins/wordpress-seo/ WordPress out of the box is already technically quite a good platform for SEO, this was true when I wrote my original WordPress SEO article in 2008 and it's still true today, but that doesn't mean you can't improve it further! This plugin is written from the ground up by WordPress SEO consultant and WordPress developer Joost de Valk to improve your site's SEO on all needed aspects. While this WordPress SEO plugin goes the extra mile to take care of all the technical optimization, more on that below, it first and foremost helps you write better content.

Akismet

http://wordpress.org/extend/plugins/akismet/ Akismet checks your comments against the Akismet web service to see if they look like spam or not and lets you review the spam it catches under your blog's "Comments" admin screen.
http://wordpress.org/extend/plugins/all-in-one-seo-pack/ Optimizes your WordPress blog for Search Engines ( Search Engine Optimization ).

All in One SEO Pack

This plugin will generate a special XML sitemap which will help search engines like Google, Bing, Yahoo and Ask.com to better index your blog.

Google XML Sitemaps

http://wordpress.org/extend/plugins/google-sitemap-generator/

W3 Total Cache

http://wordpress.org/extend/plugins/w3-total-cache/ The only WordPress Performance Optimization (WPO) framework; designed to improve user experience and page speed.