Why WordPress?
One of the reasons why people use WordPress is the seemingly unlimited numbers of open source plugins available. This enables you to create a website and blog where visitors are engaged. Which is a key to success. It’s critical to create an experience that enables your web visitors to be easily entertained, engage and share your content with their network on the social networks as easily as possible.
 
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Check out these 20 WordPress Plugins and enhance your SEO, audience engagement and brand in 2011. All the plugins listed here are tested with WordPress 3.2.1.  Hopefully, this article help make your site better and can act as a reference for fellow WordPress developers.

Google Analytics for WordPress
Track your WordPress site easily and with lots of metadata: views per author & category, automatic tracking of outbound clicks and pageviews. This is great for gathering stats for Google Adsense and measuring your quality of content.

All in One SEO Pack
Out-of-the-box SEO for your WordPress blog.  Automatically optimizes your WordPress blog for Search Engines (Search Engine Optimization). This plugin offers almost all the SEO function you would like. Very recommended.

Contact Form 7
Contact Form 7 can manage multiple contact forms, plus you can customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and so on. Easy to integrate a contact form everywhere on your website.

Google XML Sitemaps
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. With such a sitemap, it’s much easier for the crawlers to see the complete structure of your site and retrieve it more efficiently. The plugin supports all kinds of WordPress generated pages as well as custom URLs. Additionally it notifies all major search engines every time you create a post about the new content.

Revision Control
Revision Control is a plugin for WordPress 2.9+ which gives the user more control over the Revision functionality.

The plugin allows the user to set a site-global setting (Settings -> Revisions) for pages/posts to enable/disable/limit the number of revisions which are saved for the page/post. The user may change this setting on a per-page/post basis from the Revisions Meta box.

The plugin also allows the deletion of specific revisions via the Revisions post metabox.