1) Google XML Sitemaps

This plugin will create a Google sitemaps compliant XML-Sitemap of your WordPress blog. It supports all of the WordPress generated pages as well as custom ones. Everytime you edit or create a post, your sitemap will be updated and all major search engines which support the sitemap protocol like ASk.com, Google, MSN Search and YAHOO are notified about the update.

2) SEO Title Tag

Title tags are arguably the most important of the on-page factors for search engine optimization (”SEO”). It blows my mind how post titles are also used as title tags by WordPress, considering that post titles should be catchy, pithy, and short-and-sweet; whereas title tags should incorporate synonyms and alternate phrases to capture additional search visibility.

3) Subscribe to Comments

Subscribe to Comments is a robust plugin that enables commenters to sign up for e-mail notification of subsequent entries. The plugin includes a full-featured subscription manager that your commenters can use to unsubscribe to certain posts, block all notifications, or even change their notification e-mail address!

4) Get Recent Comments

This plugin shows excerpts of the latest comments and/or trackbacks in your sidebar. You have comprehensive control about their appearance. This ranges from the number of comments, the length of the excerpts up to the html layout. You can let the plugin order the comments by the corresponding post, or simply order them by date. The plugin can (optionally) separate the trackbacks/pingbacks from the comments. It can ignore comments to certain categories, and it offers support for gravatars.

5) Akismet

A plugin which identifies and blocks comment and trackback spam on blogs with integration to various blogging systems

What else?

If you have lot of comments in single post, try Paged Comments. Paged Comments enables comment paging. Useful for those popular blog entries receiving many comments, or a simple guestbook page within WordPress.

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