Ever seen on flickr how some pictures can be used for non commercial projects and with other photos you need to obtain rights from the owner no matter what. In the same way Andy Clarke and Brian Suda wanted to create a system that allows people to provide such information about their 'tweets' on twitter. So now people know with this system, that they can use your tweets and under what conditions...
TweetCC even had it's place on the Wired home page ! Read the article here.
Andy is really passionate about his work and gives 100 percent of himself on his projects. This is just another example and his will to share the great ideas with everyone. I say bravo...