Flock has supplanted Firefox as my favorite browser. It is powered by Mozilla, the same engine that supports Firefox, however it has so many more features designed for our new social, digital world. There is a nice demo of Flock by Candy With A Why, so I won't recreate the wheel.
Here's what I like about it. It is a nice tool for handling all your RSS feeds. Sometime back I said that we needed an Outlook type platform to make RSS as ubiquitous as email. Flock is close. It also makes it simple to handle all of my accounts: del.icio.us, Facebook, LinkedIn, Twitter, you name it. Finally, it has a feature that allows you to track your friends on all their accounts. Get it, use it.