Top must have Plugins for your WordPress
This is the collections that I use for all of my WordPress sites. You can try them to your WordPress to optimize most of the things.
Version 2.5.3 | By Automattic | Visit plugin site
Used by millions, Akismet is quite possibly the best way in the world to protect your blog from comment and trackback spam. It keeps your site protected from spam even while you sleep.
Executable PHP widget
Faster Image Insert
Version 2.2.0 | By David Frank | Visit plugin site
Fully integrates media manager into editing interface, avoid having to reload it separately in thickbox pop-up; comes with enhanced features, suitable for precise image control.
Google XML Sitemaps
Jetpack by WordPress.com
Version 1.2.1 | By Automattic | Visit plugin site
Bring the power of the WordPress.com cloud to your self-hosted WordPress. Jetpack enables you to connect your blog to a WordPress.com account to use the powerful features normally only available to WordPress.com users.
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SEO SearchTerms Tagging 2
Version 6.9.7 | By SEO Design Solutions | Visit plugin site
This all-in-one SEO plugin gives you control over title tags, noindex/nofollow, meta tags, rich snippets, slugs, canonical tags, autolinks, 404 errors, rich snippets, and more.
Active Modules: 404 Monitor | Canonicalizer | Code Inserter | Competition Researcher | Deeplink Juggernaut | File Editor | Internal Relevance Researcher | Link Mask Generator | Linkbox Inserter | Meta Description Editor | Meta Keywords Editor | Meta Robot Tags Editor | Miscellaneous | Module Manager | More Link Customizer | Nofollow Manager | Permalink Tweaker | Plugin Settings | Rich Snippet Creator | SEO Ultimate Widgets | Settings Monitor (Beta) | Sharing Facilitator | Title Tag Rewriter | Webmaster Verification Assistant | Whitepapers
Simple Yearly Archive
Strictly Auto Tags
Version 2.6 | By Rob Reid | Visit plugin site
This plugin automatically detects tags to place against posts using existing tags as well as a simple formula that detects common tag formats such as Acronyms, names and countries. Whereas other smart tag plugins only detect a single occurance of a tag within a post this plugin will search for the most used tags within the content so that only the most relevant tags get added.
WP to Twitter
Version 2.3.10 | By Joseph Dolson | Visit plugin site
Posts a Twitter status update when you update your WordPress blog or post to your blogroll, using your chosen URL shortening service. Rich in features for customizing and promoting your Tweets.