I've started using lovely COREBlog by Atsushi Shibata at work recently as a "work blog". It's not going live because it's company internal stuff such as "Don't forget to send the invoice to Foobar Ltd".
I think COREBlog has a lot of potential. One of the best features is that it supports the Blogger, MovableType and MetaWeblog APIs which means that I can very quickly jot down new blog items without disrupting my workflow.
There are still some little issues that annoy me but not really stopping me from doing what I want to do. The one thing that annoys me the most is the design. It's better than nothing but it really isn't great in my opinion. Where can I find some other existing neat looking COREBlog instances willing to share their stylesheet? I wish there was a way that I can search Google for all blogs generated by COREBlog and then just open them one by one.