I noticed that this update spent an unusually long time on the Configuring Installation stage right at the start, particularly on my G4, with the sound of lots of disk activity. After that it went OK, although also quite a long restart. The usual Shockwave permissions to repair because of the Flash update, of course. All seems well, though.
iBookG4 and DP G5 10.4.11
Apple Security Update
For Tiger Mac OS X 10.4.
Version: 2009-005