Apple today released Mac OS X 10.5.2 and Mac OS X Server 10.5.2 which are recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac. The OS X 10.5.2 Combo Update is 343MB and the Server update is 382MB. It is one of the biggest update for Mac OS ever released. The update includes improvement to active directory, airport, dashboard, dock, desktop, iCal and the list is very long and you can read the complete details here.
Download Links:
Mac OS X 10.5.2 Combo Update
Mac OS X Server 10.5.2 Combo Update