Mac OS X 10.5.1 Update Released
 

The 10.5.1 Update for Mac OS X Leopard is 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. For detailed information on this update, please visit this page. To update to Mac OS X 10.5.1, use Software Update or the standalone installer here.

Source: Apple