Apple released an update for Quicktime. The update, 7.3.1, addresses an RTSP vulnerability that was recently discovered. Patch notes can be found here.
Another update, Java for Mac OS X 10.4, Release 6. This update improved reliability and compatibility for Java 2 Platform Standard Edition 5.0 and Java 1.4 on Mac OS X 10.4.10 and later. Patch notes available here.
And finally, GarageBand updated to 4.1.1 which adds the ability to make your own custom iPhone ringtones. Patch notes can be found here.