Here is a selection of 25 useful plugins for your WordPress that covers different areas, from performance of the website to SEO and social media:
Enhancing content

Scribe SEO – instructs web writers how to tweak their content to get more search engine traffic, all while maintaining quality reader-focused copy
iflickr – allows to easily download Flickr photos that are licensed under Creative Commons to the local server for attaching to posts
Photo Dropper – lets you add Creative Commons licensed Photos to Your Posts from Flickr
WordPress Video Plugin – allows easy video embedding …

Wordpress is becoming more & more flexible every day, no longer is it just a blogging platform. Now, by simply activating a plugin, you can transform your blog into a fully functional eCommerce store, ready to sell your products. Here is the list of best Wordpress eCommerce plugins, both free and paid:
1. WP-eCommerce (free) – the most popular eCommerce plugin, has been downloaded over 300,000 times so far. There’s a free version & a gold version, both also working with WP-MU. Main features: