Browser Shots
Browser Shots is a plugin that gives you an easy method to embed screenshots of third party websites into your blog posts.
Browser Shots uses a shortcode to embed screenshots of websites automatically. The plugin uses an API developed by Automattic for use on WordPress.com.
Since the plugin uses a third party API I have no control over the screenshots and how they are generated.
If you’re interested in how it works then I wrote a tutorial explaining how to add the Shortcode to your own WordPress themes.