Not really much there yet. Many of the functions only sort of work. I had trouble with the blog editor, flickr bar and delicious links (all of which are supposed to be ‘core’ function of Flock. I can still do most of the things Flock does from Firefox with a couple of bookmarklets.
Certainly not willing to give up on it yet, but this is NO where near living up to the hype (guess that is the problem with generating a bunch of hype).