The ShareThis WordPress plugin provides a simple way for users to add your post to many social bookmarking sites, or to send a link to your post via email, AIM, Facebook, Twitter and more. To check out the ShareThis plugin for WordPress, visit: http://sharethis.com/wordpress

You can customize the ShareThis widget on your site as well as register for a dashboard that will track share events and provide reporting.

Pricing: Free
Requirements: WordPress 2.7+
Source: http://wordpress.org/extend/plugins/share-this/

Using Booking Calendar Plugin, you can add booking service to your site. Your site visitors can make booking of one or several days. Its can be interesting for hotel reservation service, rental service or any other service, where is needed making reservation at specific dates.

Pricing: Free
Requirements: WordPress 2.7
Source: http://wordpress.org/extend/plugins/wpdev-booking/

WP Wall is a “Wall” widget that appears in your blog’s side bar. Readers can add a quick comment about the blog as a whole, and the comment will appear in the sidebar immediately (without reloading the page).

All comments are internally handled by WordPress so that means you have normal comment moderation, SPAM protection and new comment notification. WP Wall is fully customizable with a CSS file and included graphics.

Pricing: Free
Requirements: WordPress 2.8
Source: http://www.prelovac.com/vladimir/wordpress-plugins/wp-wall

Google Analyticator adds the necessary JavaScript code to enable Google Analytics logging on any WordPress blog. This eliminates the need to edit your template code to begin logging. Google Analyticator also includes several widgets for displaying Analytics data in the admin and on your blog. It includes a graph of the last 30 days of visitors, a summary of site usage, the top pages, the top referrers, and the top searches.

Pricing: Free
Requirements: WordPress 2.7+
Source: http://wordpress.org/extend/plugins/google-analyticator/

Shopp is an e-commerce plugin that adds a feature-rich online store to your WordPress-powered website or blog. Get your store up and running in minutes. Then, take it to the next level with the flexibility of Shopp’s customization tools that allow production studios and power users to tailor every aspect of the shopping experience.

Shopp looks and works like it was meant to be part of WordPress all along. With support for SSL security, transaction information is encrypted during processing and no credit card information is stored on your website to ensure your shoppers’ safety.

Pricing: Single ($55), Developer ($299)
Requirements: WordPress 2.8
Source: http://shopplugin.net/

WP Greet Box lets you show a different greeting message to your new visitors depending on their referrer url. For example, when a Digg user clicks through from Digg, they will see a message reminding them to digg your post if they like it.

You can also set a default greeting message for new visitors suggesting them to subscribe to your RSS feed. Having these targeted suggestions will help your blog increase exposure, loyal readership, and reader interaction. Best of all, this plugin is compatible with WPMU and various WordPress cache plugins.

Pricing: Free
Requirements: WordPress 2.6+
Source: http://wordpress.org/extend/plugins/wp-greet-box/

There is a new interesting plugin open source for WordPress, called MeeNews, a tool that lets you customize the layout of the template as you like, manage mailing lists, create newsletters with a pleasant style Html.

Its configuration is very easy and simple and does not require much knowledge of programming, plus you have a video demo and installation manuals in pdf format that will guide you during the installation and configuration. A newsletter that meets all the anti-spam requirements, complatible with these mail clients, e.g. Outlook, Thunderbird, Gmail, Hotmail, etc…

Pricing: Free
Requirements: WordPress 2.7+
Source: http://www.wp-newsletter.com/

It happens quite often that a blogger publishes posts or static pages on a regular basis which have the same structure. Think about for example a “picture of the day” daily post. With current wordpress state, we need to spend a lot of time doing copy/paste between posts instead of actually writing content.

Be happy because Vincent Prat has developed the Post Templates Plugin to maintain post templates and allow simple writing of regular posts.

Pricing: Free
Requirements: WordPress 2.7.1
Source: http://wordpress.org/extend/plugins/post-template/

WP System Health supports a comprehensive overview about your current WordPress installation in terms of internal states, PHP and Server environment. It adds a new Dashboard Widget at your Blog for Administrators only and is perfect to reduce your spend amount of time doing your service desk operations with non experienced blog user or customers.

This Dasboard widget requires a WordPress version equal or higher than 2.7 and a PHP version of 4.4.3 and higher. This Dashboard extension only displays some information but doesn’t change them nor provides any changing capabilities. It’s also limit to users that are member of the group “Administrator”. All other user won’t get this Widget in their Dashboard and the widget doesn’t collect any data in this case.

Pricing: Free
Requirements: WordPress 2.7+
Source: http://www.code-styling.de/english/development/wordpress-plugin…

Tweetable is a WordPress Plugin intended to help integrate Twitter into your blog. It can tweet your blog posts as they are published, shortening the URLs with either Tr.im or Is.gd and optionally including Google Analytics campaign tags. You can display your latest tweet(s) in your blog sidebar with a customizable widget, which can even display your follower count.

Tweetable adds functions that turn the WordPress admin into a twitter client. The Tweet screen lets you update your status and browse your friends’. The Track page let’s you save keywords to be searched so you can keep an eye on what Twitter as a whole is saying about a given topic. You can set the minimum user level required to access the menus if you would like to allow other authors access.

Pricing: Free
Requirements: WordPress 2.7+
Source: http://www.webmaster-source.com/tweetable-twitter-plugin-wordpress/