As I mentioned a while back I moved techNOcool: Back to Firefox for my web browsing needs. I have found that I miss some of the nice built in social networking features of Flock so I went looking for Firefox plugins to meet those needs.
I found a few of them and added them. What I found is that while there are plugins available using them is not as nice using the built in features of Flock. That being said I am sticking with Firefox mostly because it loads faster and the delicious plugin works better than the flock/delicious integration.