I install, customize, and maintain over 50 blog sites using the WordPress software, and plugins. Regardless of the type of site I’m working on, I always install certain plugins. Security, tracking, and easy use and maintenance are the goals for this base set of plugins.
WP-DB-Backup allows you easily to backup your core WordPress database tables. You may also backup other tables in the same database.
Automattic (the creators of WordPress) created its own stats system, to focus on just the most popular metrics a blogger wants to track and provide them in a clear and concise interface.
Optimizes your WordPress blog for Search Engines (Search Engine Optimization).
Scans your WordPress installation for security vulnerabilities and suggests corrective actions.
cforms is a highly customizable, flexible and powerful form builder plugin, covering a variety of use cases and features from attachments to multi form management, you can even have multiple forms on the same page!
This plugin will create a Google sitemaps compliant XML-Sitemap of your WordPress blog. It supports all of the WordPress generated pages as well as custom ones. Everytime you edit or create a post, your sitemap is updated and all major search engines that support the sitemap protocol, like ASK.com, Google, MSN Search and YAHOO, are notified about the update.