The patch notes state the following:
The 10.5.8 Update 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, as well as specific fixes for:If you're not one for Software Update, we've included download links below. Let us know how the update goes!
- Compatibility and reliability issues when joining AirPort networks.
- An issue that could cause some monitor resolutions to no longer appear in Displays System Preferences.
- Issues that may affect Bluetooth reliability.
- For detailed information on this update, please visit this website: http://support.apple.com/kb/HT3606.
- For information on the security content of this update, please visit: http://support.apple.com/kb/HT1222.
Download: Mac OS X 10.5.8 Update
Download: Mac OS X 10.5.8 Combo Update
Download: Mac OS X Server 10.5.8 Update
Download: Mac OS X Server 10.5.8 Combo Update