flock

Flock is a free, open source, cross platform social browser, based on Mozilla technologies. It includes features such as blogging tools, feed handling, integrated del.icio.us favorites and Flickr photo sharing. Flock is currently available only as a developer preview with a more stable, public beta expected by the end of the year.

Flock is the first browser that does not consider the user to be a passive consumer of content. “You can blog and post directly to your publishing platform, you can bookmark pages directly on del.icio.us, you can post and interact with Flickr, while utilizing one of the most elegant and soothing browser interfaces out there. This is why Flock has been labelled the social browser: because it opens up for everyone the ability to contribute, share and talk back to the Web in a direct and easy fashion” (from Robin Good)

More is information available on the Flock Community Wiki.