Yes!

@clarocada licenses tweets with Creative Commons.

@tweetcc Your activation 'click to license' buttons not obvious enough. Think they may need to be a little more obvious, use 'Click here to'

Permission was granted on Wed, Feb 18 2009 at 14:39:20 · View tweet

@tweetcc Helps to have a tweet 'trigger' on site to allow 1-click licensing. See 'retweet' code on any blog at http://digitalbiographer.com

Permission was granted on Wed, Feb 18 2009 at 14:32:49 · View tweet

@tweetcc I license my tweets under a Creative Commons Public Dedication License

Permission was granted on Wed, Feb 18 2009 at 14:30:09 · View tweet