This sectoin of sites deals with emails that seem to have a complete web site inside of the email. I can certainly see the logic in this. Put the email contents within the context of the web site. This way viewers have the chance to click on anything they want, not just the content specific to that email blast.
A perfect example is the email from CNN.com. This email looks like a full blown web site. Emails such as are a sort of shotgun approach to email campaigns. That is to say that they have a broad approach and include everything they can. One down side of such an approach is that the actual email file becomes very large. This particular example is great in that it brings you the news you requested with the ability to reach out for more in a framework the frequent reader would be familaure with.