Post Administration & Layout
Add Graphic Signature - Adds a graphic of your signature to your posts either automatically or via the insertion of a simple tag.
Adman - Allows you to post ads such as Google AdSense at the beginning or middle of a post.
Another WordPress Meta Plugin - Allows you to add Meta tags and keywords to your post to try to further optimize your blog for search engines.
Category Remindr - Category Remindr puts a button next to the â€œPublishâ€ button to remind you to select the categories for your post.
Corrector - Adds Google Spell to your admin area and can spellcheck in 27 languages.
DropCap First Character - Enlarges the first character of a post to give it more of a magazine appearance.
Front Page Excluded Categories - Sometimes you don't want posts from certain categories on your front landing page, this allows you to exclude them from appearing there.
Limit the size of main page posts - Set the number of words you want each of your main page posts to contain, if they exceed that limit, a link is provided to a page with the complete post.
Notify On Draft Post - Notifies the editor when the authors of a multi-author blog post a new draft for review.
Post Notification - Sends an email to all of the registered Users, who have opted in, when you make a new post. Includes the option to include the post in the email.
Post Repeater - Sometimes you have a post with significance every week, month, or year; this plugin will do it for you with just a few edits.
Post Templates - Allows you to set up repeating templates such as a â€œPicture Of The Dayâ€ and so on without all the tedious copy and pasting.
PostPost - Allows you to add content such as advertisements before or after every post.
Posts Expire - Set an expiration date on your post, after the date passes, it will no longer be displayed.
Subscribers Only - Lets you mark a post as â€œsubscriber onlyâ€ so they are visible only to members of your site.
Subscribe-Remind - Adds a reminder to the bottom of each post to your readers to subscribe to your RSS feed.
WordPress PDA - Helps your readers view your blog on a PDA browser.
WP-orderposts - As more people use WordPress also as a CMS, sometimes you don't want your posts in chronological order; this plugin allows you to change it.
WP-Sticky - Sometimes you want a post to always be the first entry for your blog, especially when using WordPress as a makeshift CMS. This plugin does just that by making a post â€œstickyâ€.
Auto Link - Use the Google API to set delimiters like [movie]Move Title[/movie] to make it auto link to the page on IMDB. Can set others as you wish.
Author Complete Post List - Gives you the ability to display all the posts by an author, including the ones where they are co-author.
Blog by Mail with Categories - Changes the â€œBlog by Mailâ€ feature in WordPress so you can also set the category.
Code Markup - Allows you to include snippets of code, including HTML, in your post without it affecting the page.
Easy Post-To-Post Links - Allows you to use a shortcut when writing a post linking to another post on your blog; shows the full hyperlink in the published post.
On This Day - Will display posts posted on the same day in previous years.
Plain Text Paste - Helps to ease the pain of pasting something you wrote in Microsoft Word into WordPress.
TD Word Count - Will display a word count for each post on a blog, and gives you a total count.
Ubernyms - Allows you to make shortcut for terms and links you use often. Just enter the abbreviation and this plugin fills it in for you.
WP-Footnotes - Allows you to add footnotes to a more detailed post.
wpSpoiler - Great for sites that do movie or TV reviews, will allow you so hide text behind [spoiler] tags. (via)