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Link Luv is a module for ExpressionEngine that's similar to Comment Luv for WordPress. When a visitor to your site leaves a comment on your blog, it will display a link to the most recent entry from their RSS feed.

KeyAds is a module for ExpressionEngine that allows you to display content to your visitors—like an ad or block of HTML code—based on keywords they enter in a search engine, or based on the referring domain.