"Embedding content in a frame" is the hot topic in web application security these days. It is a great way to get a viewer's information stolen. 

One of the ways that this could happen:
Say that I am a Bad Guy, and I want to steal your Google Account password.  An easy way to do that would be to put a frame around a Google site and then once the user has done something within that frame, give them a fake login prompt.

Since the fake login prompt is within a frame the user cannot tell if they're actually logging into www.google.com or www.tech911.info. You might not know the site you're logging into is HTTPS. Logging into any site over HTTP is especially dangerous if you're using an unsecured connection, such as a coffeshop's WiFi connection).

It's felt it is more important to protect all users' data. Hence why my web sites frames are broken.