Iframely for Gmail Adds Inline Previews to Links in Gmail
Chrome: A few years ago, Google added inline previews to Gmail so you could quickly see links that came from YouTube or Flickr. They never went beyond those services, which is where Iframely comes in.
Iframely supports full web pages, Soundcloud, Twitter, Vimeo videos, and more. When someone sends you a link in your email, you can preview it right there in the email itself, no need to leave Gmail. It's a pretty handy feature, and since Iframely runs mostly in the background you'll quickly forget it's even there.