This is an interesting idea from Biz Stone. Imagine an email service where everything was open. Obviously, private information for the most part wouldn’t be shared, but there’d be many interesting things that could crop out of such a service.
People are becoming more comfortable by the day sharing parts of their online lives with friends and strangers. They’re sharing their music, their bookmarks, their news, their friends, their reviews, their thoughts, their RSS feeds, their video, and their pictures. Why not email?
Well something similar is available in form of scraps in Orkut (maybe in other community sites too..)