Here is what my logs show for the last three updates that ran
successfully:

Nov 14 10:02:13 Updated: 1:libvorbis-1.1.2-3.el5_4.4.x86_64
Nov 14 10:02:13 Installed: libmpeg2-0.5.1-2.el5.rf.x86_64
Nov 14 10:02:14 Installed: libmpeg2-utils-0.5.1-2.el5.rf.x86_64
Nov 14 10:02:17 Updated: httpd-2.2.3-31.el5.centos.2.x86_64
Nov 14 10:02:17 Updated: dbus-python-0.70-9.el5_4.x86_64
Nov 14 10:02:18 Updated: 1:libvorbis-1.1.2-3.el5_4.4.i386
Nov 14 10:02:19 Updated: 1:libvorbis-devel-1.1.2-3.el5_4.4.i386
Nov 14 10:02:19 Updated: 1:libvorbis-devel-1.1.2-3.el5_4.4.x86_64
Nov 14 10:02:19 Erased: mpeg2dec
Nov 17 21:26:08 Installed: aide-0.13.1-4.el5.x86_64
Nov 24 22:04:43 Updated: 1:cups-libs-1.3.7-11.el5_4.4.x86_64
Nov 24 22:04:44 Updated: 1:cups-libs-1.3.7-11.el5_4.4.i386
Nov 24 22:04:52 Updated: 1:cups-1.3.7-11.el5_4.4.x86_64
Nov 27 08:59:17 Installed: twolame-0.3.12-1.el5.rf.x86_64
Nov 27 08:59:18 Updated: gstreamer-plugins-ugly-0.10.11-1.el5.rf.x86_64
Nov 27 08:59:18 Updated: gstreamer-ffmpeg-0.10.6-1.el5.rf.x86_64
Nov 28 08:35:38 Updated: metacity-2.16.0-12.el5_4.1.x86_64
Nov 28 08:35:38 Updated: xterm-215-8.el5_4.1.x86_64
Nov 28 08:35:39 Updated: kexec-tools-1.102pre-77.el5.3.x86_64
Nov 28 08:35:41 Updated: system-config-lvm-1.1.5-1.0.el5_4.1.noarch
Nov 28 08:35:47 Updated: metacity-2.16.0-12.el5_4.1.i386


So...maybe I'm just an IA guy with a worrying problem.  I'm used to my
Windoze boxes updating nearly every time I boot them.  I'm also used to
Fedora 10 and 11 which seem to have updates every two or three days.

DaveM