All those with blogs that are hosted by wordpress.com have a blue navigation bar at the top. The blue navigation bar can be seen only by those who are signed into wordpress.com. Is this what you are referring to?
I was thinking about the css upgrade (i wrote “css customization tool” ’cause I forgot the name =p ) .
Sometimes the admin bar don’t matches with your blog’s template, and I was trying to find some settings for it on the Dashboard menu.
….. maybe it’s time to take the Upgrade and work directly with css! xD