Chris Messina details a new microsyntax for Twitter, using a slash delimiter to denote metadata (like via, cc, and by). The concept is well described and looks fantastic, but I wonder if widespread adoption is possible—especially considering popular clients like Tweetie employ a different format by default.
I believe that adding metadata to our Tweets is actually a good thing not only will it organize them but it can help to index them much better and be used in a variety of different & interesting ways.