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. It's a handy feature, and you'll quickly forget it's even there since Iframely runs mostly in the background.