FeedBurner FeedSmith

Redirects all feeds to a Feedburner feed

Google Analytics for WordPress

This plugin makes it simple to add Google Analytics with extra search engines and automatic clickout and download tracking to your WordPress blog.

Google XML Sitemaps

This plugin will generate a sitemaps.org compatible sitemap of your WordPress blog which is supported by Ask.com, Google, MSN Search and YAHOO.

HeadSpace2

Meta-data manager on steroids, allowing complete control over all SEO needs such as keywords/tags, titles, description, stylesheets, and many many other goodies.

Insights

Insights allows you to quickly search and insert information (links, images, videos, maps, news..) into your blog posts.

My Page Order

My Page Order allows you to set the order of pages through a drag and drop interface. The default method of setting the order page by page is extremely clumsy, especially with a large number of pages.

SI CAPTCHA

Adds CAPTCHA anti-spam methods to WordPress on the comment form, registration form, or both. This prevents spam from automated bots.

Sociable

Automatically add links on your posts, pages and RSS feed to your favorite social bookmarking sites.

What Would Seth Godin Do  (because I have such a crush on him)

Displays a custom welcome message to new visitors and another to return visitors.

WordPress Online Automated Backup

Plugin that allows you to backup and restore your wordpress blog very easily. Read how it works before installing. Requires an account on WordPressBackup.com (free acounts available).

WP tags to Technorati

Simple plugin to convert WordPress 2.3′s tags to Technorati (‘http://technorati.com’) links.

Social Links

Social Links is a sidebar widget that displays icon links to your profile pages on other social networking sites.

Leave a comment with your faves.