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Here’s my list of the most useful Wordpress plug-ins. I’ve included why I’ve found them helpful or why they are must-have plug-ins.

SEO Plug-ins

All-in-One SEO Pack – It seems like this is pretty much the industry standard for SEO plug-ins. It handles titles, meta, keywords, etc. And allows you to adjust them on each individual entry.
Excerpt Editor – This will automatically create an excerpt from the post and/or page. This is important for any themes that use exceprts like Thesis. Excerpts help with SEO and minimizing duplicant content on archive pages.
SEO Smart Links – This will automatically create contextual links within your content to either appropariate pages or to a list of keywords and pages that you create.

Social Networking Plug-ins

Sociable – Best looking “share this” plug-in.
Wordbook – post your blog updates onto your Facebook account.
Twitter Tools – post a link to your recent blog post on your twitter account.

Content Plugins

Post-Plugin Library and its accompanying plug-ins – This will allow you to post a list of recent posts, similar posts, and/ or popular posts at the end of your posts or pages. It also allows you to insert a list where you want it.
Widget Logic – Controls which widgets show up where based on WP’s conditional tags.
WP Greet Box – Show a message at the top of your page depending upon which site the user is coming from. Ask a Delicious user to add to their account, or a Google user to add to subscribe to your feed. This is similar to the “What would Seth Godin do” plug-in but better in my opinion.
Zemanta – When you’re writing your posts, this plug-in sits next to the box and offers up images and links that you could link to. Drag and drop an image in or click to add links.

Administrative Plugins

WP-CMS Post Control – This plugin allows you to hide unwanted items on your write pages for both posts and pages. Cleans things up a bit and keeps your writers, authors, etc. focused on the things you need them to fill out. (Example: I hide everything except the SEO stuff they need to fill out.)
Google XML Sitemaps – This will automaticaly build your sitemaps out for you and submit them to Google.

That’s my list of useful plug-ins. And I am always adding new ones and testing them out. They have to be easy to use, easy to set up and easy to understand.