With all the buzz on Flock I decided to give it a try!
My impressions are mixed. I think the default skin looks bad, it has a "toy" feel just like IE7.
I'm currently trying the "New blog post" feature, that's a good one. I'll install an extension like this in my beloved firefox (which is crying with my 50+ extensions)
There are also a few severe bugs in the main window, I don't have time to report them though
PS: I had to publish this post twice to get it working! :-/