All in One SEO Allows you to fine tune Titles and Descriptions for every page and post.
Image Friendly SEO Just to make sure that every image has a proper Title and Alt attribute, even if the site administrator forgets.
WP Super Cache With what seems to be Google’s increasing emphasis in 2010 on page load speed and to enhance your site visitor’s experience this plugin is more valuable than ever.
WordPress.com Stats A very nice companion to Akismet (they both use your WordPress.com API key). posts and pages are the most popular, where your traffic is coming from, and what people click on when they leave. It’ll also add a link to your dashboard which allows you to see all your stats on a single page..
WordPress DB Backup The database is where most of the content and access for a WordPress site resides. Backup early and often.
Twitter Friendly Links Creates a shorter link for every blog post so you can have your Tweets show a link to your website’s URL not to bit.ly or some other third party service.
Twitter Tools creates a complete integration between your WordPress blog and your Twitter account.
Page Links To This plugin allows you to make a WordPress page or post link to a URL of your choosing, instead of its WordPress page or post URL. It also lets you open a new window when a user clicks on a new link without you having to enter a target in the code.
Redirect Parent to First Child Use the parent page just for site organization or a splash page. This plugin will automatically redirect the parent page to its first currently published child page.
WP–Cycle allows you to upload images from your computer, which will then be used to generate a Plugin slideshow of the images which pauses when the user hovers over an image.
Widget Logic You may not want every widget appearing on every page. This plugin adds a conditional statement field to every widget that you can use to control on what pages the widget appears.
My Page Order Easy drag and drop reorder for your page navigation
My Category Order Easy drag and drop reorder for your category navigation
Google Analytics for WordPress The most useful analytic tool for internet marketing is Google Analytics. This plugin makes it easy to add Analytics to WordPress sites.
Google XML Sitemaps generate a special XML sitemap which will help search engines like Google, Bing, Yahoo and Ask.com to better index your blog.
Yet Another Related Posts Plugin (YARPP) It gives you a list of linked posts and/or pages related to the current entry, introducing the reader to other relevant content on your site
Sociable or Sexy Bookmarks Encourage your site visitors to share your site content across the web. Choose one or the other depending upon your demographics.
cforms II A very good contact form tool by a food blogger of all people!
Here is a list of what I (and others) consider to be the best WordPress plug-ins – from adding Google analytics and social bookmarking to adding elegant photographic slideshows, there’s something you’ll find useful here.