Okay, I'll give my non-sarcastic response :-) I think you're contradicting yourself when you first complain that "there exist no general mechanism to embed inf

Okay, I'll give my non-sarcastic response :-) I think you're contradicting yourself when you first complain that "there exist no general mechanism to embed information from sources that don't expose such embed codes," but then say that your ideal solution involves "a website that supports this mechanism/protocol." That said, this is a conceivable use of oEmbed (http://www.oembed.com http://www.oembed.com). However, for text, I think what you're looking for is called a hyperlink :D