We just released an updated for Joomscan Security Scanner. The new database have 611 vulnarbilities. Updates will be released every month or sooner. Last update for this tool was in August, 2009 with 466 vulnarbilities. In joomscan you can check for new updates with command: ./joomscan.pl check or ./joomscan.pl update.
You can also check this tutorial about Joomscan:Tweet