First of all, BSD Subsystems solely installs unix tools for the iPhone (not more applications, it has nothing to do with that. More apps come from more "sources" not the unix tools)
Secondly, summerboard was removed from the installer in order for it to be tweaked little for the 1.1.2 framework. It is currently back on the installer and functioning.
In order to put it onto your phone before it was in the installer.app program you ould have had to manually transfer the files to the appropriate folders on your phone. (as I explained in another post)
But, as of right now its working great.... Just no more mixing up unix tools ok? haha