The Twiogle Twitter commenter plugin pulls in comments from Twitter to your own blog posts.

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Prevents WordPress from eating pings that come too quickly in succession (i.e. a single post linking to more than one of your pages).

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This plugin provides a widget that let you select the comments you want to display as featured or important.

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Floating Comments allows users to post comments to your blog through a fancy form that fallows them as they scroll down.

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Gives commenters the option of Tweeting their comment with a link to your post.

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Import comments from an IntenseDebate export file.

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Comments On adds a column to the "All Posts"/"All Pages" view in the Admin dashboard showing the status of comments.

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Adds additional technical information to comment notifications, including referrer, User-Agent, and a lot more.

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