Well, back in the day it was easy to find at http://www.bb4win.com but they dropped the original BB UI and started distributing xoblite (which is crap imo). However, after a long time of searching, I finally found my favorite BB interface:

Go here: http://sourceforge.net/project/showf...group_id=56991

Scroll down to "Blackbox for Windows"

Install the 0.0.90 version, than install the upgrade right above it.

It took me a while to learn how to fully customize everything the way I wanted it. It takes some playing around with. You'll discover a lot of things accidentally and alot of things are obvious. There are also tons of plug-ins available that act as widgets for the interface. All the plug-ins start with "bb" so it should help you to find them on the net.