Kutano Firefox browser add-on that lets you make comments alongside any webpage - without the control of the website owner.
discussions from current page and/or related pages on website are displayed
discussions keyed to page topic, not url
create new discussions
add comments to existing discussions
automatically tweet Kutano comments to your Twitter account
What's new in Kutano
Version 1.1 R7:
Displays all the tweets about the currently viewed Web page - you can reply to a tweet, re-tweet it or just find a new person to follow in Twitter. Simply put, Kutano brings web-page context to the Twittersphere. The new version also provides a full Twitter client application so you can stay in touch with Twitter as you browse.