List of plugins that will significantly improve your WordPress blog from SEO and marketing point of view:
All in One SEO Pack – Optimizes your WordPress blog for Search Engines.
W3 Total Cache – Improves the user experience of your site by improving your server performance, caching every aspect of your site, reducing the download times and providing transparent content delivery network (CDN) integration.
Google XML Sitemaps – This plugin will generate XML sitemap, which will help search engines like Google, Yahoo, Bing and Ask.com to better index your blog.
Simple 301 Redirects – Create a list of URLs that you would like to 301 redirect to another page or site.
Display widgets - “WOW” plugin, that helps to manage widgets: control on which pages your widget will appear or not.
Contact Form Plugin – great plugin to create simple but stable(!) contact form for your website or blog.
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