The mouse over linkage widget is a code hack of phpbb called ItemStats. The hitch is that it doesn't support phbb3 yet
officially, 1.0 and 2.0 it does and at the time we were using a beta release of phpbb3 so I had to dink around with the php code in several files to get it to work. Did a quick google and looks like someone has a developed a decently documented work-around.
Linkage:
ItemStatsWorkaround/InstallEdit:
Looks like there is a
legacy plugin for itemstats + joomla 1.0 as well that enables itemstats in any joomla wrapper, seems some have gotten to work with 1.5, many others not so much