Here is a list of great plugins that you may find useful incorporating into your Word Press website.
Shopp
The Shopp plugin has been around for a little while and continues to be our plugin of choice when integrating an e-commerce solution for Word Press. They offer extra modules for common gateways and shipping providers, and with the ability to modify the page templates as child templates, you can style it almost any way you want.
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.
It’s no secret that most Web site traffic comes from search engines like Google®, Yahoo!® and MSN®. But how do you get listed in search results? 
Traffic Blazer makes it easy to submit your Web page(s) to leading search engines… more than 200 search engines and directories in all. But that’s not all. Now you can also list your business with YellowPages.com, and gain exposure to more than 100 million monthly consumer business searches.* To start promoting your business and increasing your online visibility with help from YellowPages.com, simply launch Traffic Blazer, go to “Submission,” then “Local Submission,” and click on “Sign up Now!” under YellowPages.com.
Analyze and optimize your site for search engine submission faster than ever. We’ve improved the Site Spider in Traffic Blazer so the Site and Keyword Analysis Tools work even faster than before. Plus, to make sure you have a better understanding of how search engines are promoting your site, we’ve updated our news and article feeds to receive the latest news and developments direct from Search Engine Land, a leading site for the search engine industry.