In the software update, Macs can now be upgraded to version 10.4.10. It is recommended that computers running Mac OS X Tiger on both PowerPC and Intel platforms upgrade as soon as possible. This update includes operating system fixes, especially those related to application compatibility — such as support for RAW digital cameras, mounted and unmounted extended USB devices — and also resolves compatibility issues with certain third-party software.
Detailed update list:
http://www.info.apple.com/kbnum/n305533
Security-related update list:
http://www.info.apple.com/kbnum/n61798