Flock is the new browser based on Firefox source code. Today, the 0.5 Developer preview has been released. Download it from here!

Here’re some screen shots:

About Window.	Integrated blogging.
Favorites based on tags	Favorites can be managed as collections or with tags (similar to technorati or flickr).
Shelf is used to store various elements, just drag and drop!	Flock Main Window
History sidebar.	Add webservices to your browser.
Blog while Browsing	Browse Flickr while surfing the net.