If you reviewing particular Website or blog, you may want to include a fresh “screenshot” from the site’s main page. That will give your visitors a better insight on what you are reviewing, and add credibility to your review.
Here, you can use the free services offered by Bitty Browser. Bitty Browser actually helps you keep track of the foreign Web stuff by enabling navigable windows directly within your own site and your own post — it's like Picture-in-Picture for the Web.
Create the widget is easy: enter the desired URL and the embed code will be created automatically. Below is example of my other blog devoted to the Web Freebies, embedded in the post.
Using the service does not require registration. Start from the main page: http://www.bitty.com/