Essential WordPress Plugins 
These are the plugins I've found most useful and well written.
Resources
This plugin adds tagging functionality to WordPress. You can produce a tag cloud, add Technorati tags and show related posts. I find more things to do with it each week, so make sure to check out the full Readme files.
This simple but effective plugin gives your users an easy way of adding the post to their del.icio.us archive.
Returns a list of the related entries based on keyword matches.
Allows readers to recieve notifications of new comments that are posted to an entry
Allows you to easily set up your blog/feed for integration with iTunes. Puts flash player right in the post. Really nice.
What is there to say? This is the best spam catcher I've ever run into.
The Search Hilite Plugin highlites Search-Words, from external Searches over Yahoo,Google and Lycos, as well as Wordpres internal Searches, on the Search Results-Pages.
Statistics plugin that let's your view top referrer, user agents, visitors countries and visitor trails on your blog. Easy to install and real alternative to wp-shortstat
If you’re not happpy with the standard look of the WordPress admin panel this plugin changes it to look a bit like Mac OSX Tiger.
Effortless installation, for a quick and easy overview of essential statistics to measure traffic. Screenshots and upgrades for WP 2.0.1 can be found here.
The ImageManager provides an interface for browsing and uploading image files on/to your server. The Editor allows for some basic image manipulations such as, cropping, rotation, flip, and scaling.
Home Office World offer a range of home office equipment and furniture, including; office chairs, desks, tables and various storage devices.
Offers laptop parts including replacement batteries, AC adapters, notebook chargers, and other accessories for Dell, Sony, Compaq, and Toshiba laptops.
Offers laptop parts including replacement batteries, AC adapters, notebook chargers, and other accessories for Dell, Sony, Compaq, and Toshiba laptops.
Vacuum-Home takes pride in the vacuum cleaner products they offer their clients.
Computer - Human Edited SEO Friendly Web Directory
Kids and Teens - Human Edited SEO Friendly Web Directory
Coreix provides 100% Carbon Neutral hosting solutions including powerful dedicated servers, Managed Server, colocation, Rackspace and Hosted Exchange.
Arts RapidCoolSite - Human Edited SEO Friendly Web Directory
Business RapidCoolSite - Human Edited SEO Friendly Web Directory
Computers RapidCoolSite - Human Edited SEO Friendly Web Directory
Games RapidCoolSite - Human Edited SEO Friendly Web Directory
Health RapidCoolSite - Human Edited SEO Friendly Web Directory
Home RapidCoolSite - Human Edited SEO Friendly Web Directory
Kids and Teens RapidCoolSite - Human Edited SEO Friendly Web Directory
Misc RapidCoolSite - Human Edited SEO Friendly Web Directory
Huckster provides top-quality plastic bags at the most competitive prices in the industry, all available for immediate shipment.
News RapidCoolSite - Human Edited SEO Friendly Web Directory
Recreation RapidCoolSite - Human Edited SEO Friendly Web Directory
Reference RapidCoolSite - Human Edited SEO Friendly Web Directory
Regional RapidCoolSite - Human Edited SEO Friendly Web Directory
Design consultation, installation, retrofit, modernization, repairs, cleaning & maintenance, parts & supplies. Tate access floor supplier.
Science RapidCoolSite - Human Edited SEO Friendly Web Directory
Shopping RapidCoolSite - Human Edited SEO Friendly Web Directory
Design consultation, installation, retrofit, modernization, repairs, cleaning & maintenance, parts & supplies. Tate access floor supplier.
Society RapidCoolSite - Human Edited SEO Friendly Web Directory
Trans Atlantic manufactures and installs the highest quality granite countertops for home owners, commercial establishments and custom builders.
Sports RapidCoolSite - Human Edited SEO Friendly Web Directory
If you are planning to invest in the real estate sector, you can seek the services of the Yorktowne Group. The Yorktowne Group a long history of offering their expertise and unique assets to benefit investors.
International Jobs and Careers. Free employment site free corporate job site and career tools from Search Jobs Careers Recruiting corporate career site service, including free resume search, free job postings and free resume postings.
Apartments Budapest: Navigare Apartments Budapest Hungary
Offers software for freight forwarding, logistics management, cargo tracking, export documentation and a complete solution to manage all aspects of cargo transportation business.
Banking and Credit SEO Dir - Human Edited SEO Friendly Directory
Financial Milestones SEO Dir - Human Edited SEO Friendly Directory
Investing and Economics SEO Dir - Human Edited SEO Friendly Directory
Taxes and Accounting SEO Dir - Human Edited SEO Friendly Directory
Money Management and Planning SEO Dir - Human Edited SEO Friendly Directory
Real Estate SEO Dir - Human Edited SEO Friendly Directory