Apple Security Update 2006-008 (for OSx 10.4.8 only) is available through software update and Version Tracker.
Security Update 2006-008 is recommended for all users and improves the security of the following components:
Quartz Composer
QuickTime for Java
Bob K. rnkiii
p.s. So is the 'on-again off-again' MS Office update (for those who care).