Here are a list of my favorite WordPress plugins that are SEO-related.  My install also includes quite a few hacks directly to the source, but only because I didn't do it the "right" way.  These are the essentials:

Chicklet Creator
Adds feed subscription buttons to a WordPress blog.

Enables users to send a post to a friend.

Automatically adds links on posts to popular social bookmarking sites.

Google Sitemaps
Creates a Google-compliant sitemap of a WordPress blog.

I will also mention Mudbomb's WSYI-Wordpress, which is much better than the WYSIWYG editor included with WordPress, and allows for hand-editing conveniently.

Anyone else have anything to add? Leave a comment.

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