This is tied to your going outside the CentOS repo base (and your loading of a newer version of KDE) ...
I'm innocent, I swear!
At one point, all I wanted to do was install Amarok, the KDE MP3 player. But the download instrictions said I needed to install another repository, I couldn't just download a single RPM. So then I did a yum update, and it did a whole bunch of stuff, including update KDE to 3.4, and probably a whole mess of stuff I didn't want or need it to do. All I wanted was an MP3 player, and I got a whole new interface as well.
So, anyway, I ran yum list extras, and I got a bunch of results. But I can't tell if any of them would be particularly problematic.
[root@localhost ~]# yum list extras Setting up Repos dag 100% |=========================| 1.1 kB 00:00 kbs-CentOS-Extras 100% |=========================| 951 B 00:00 kbs-CentOS-Misc 100% |=========================| 951 B 00:00 update 100% |=========================| 951 B 00:00 base 100% |=========================| 1.1 kB 00:00 addons 100% |=========================| 951 B 00:00 extras 100% |=========================| 1.1 kB 00:00 Reading repository metadata in from local files dag : ################################################## 2471/2471 kbs-CentOS: ################################################## 1210/1210 kbs-CentOS: ################################################## 60/60 update : ################################################## 95/95 base : ################################################## 1406/1406 extras : ################################################## 32/32 Excluding Packages in global exclude list Finished Extra Packages ImageMagick.i386 6.2.3.0-0.1.el4.kde installed arts.i386 8:1.4.2-1.1.el4.kde installed automake16.noarch 1.6.3-5.fdr.4 installed boost.i386 1.32.0-3.1.rhel4 installed boost-devel.i386 1.32.0-3.1.rhel4 installed gamin.i386 0.0.26-0.0.rhel4.kde installed gamin-devel.i386 0.0.26-0.0.rhel4.kde installed ghostscript.i386 7.07-37.0.rhel4.kde installed gnokii.i386 0.6.7-1.2.el4.rf installed gpg-pubkey.None 6b8d79e6-3f49313d installed gpg-pubkey.None 6b8d79e6-3f49313d installed gpg-pubkey.None ff6382fa-3e1ab2ca installed gpg-pubkey.None 3e13cf5b-422eea1c installed gpg-pubkey.None 443e1821-421f218f installed gpg-pubkey.None 3e13cf5b-422eea1c installed gpg-pubkey.None 6b8d79e6-3f49313d installed gtk+.i386 1:1.2.10-33.5.rhel4.kd installed gtk+-devel.i386 1:1.2.10-33.5.rhel4.kd installed gtk-chtheme.i386 0.3.1-1 installed iiimf-client-lib.i386 1:11.4-43 installed iiimf-client-lib-devel.i386 1:11.4-43 installed iiimf-protocol-lib.i386 1:11.4-43 installed iiimf-protocol-lib-devel.i386 1:11.4-43 installed kernel.i686 2.6.9-11.106.unsupport installed kernel-module-ntfs-2.6.9-11.EL.i686 2.1.20-0.rr.6.0 installed kterm.i386 6.2.0-36 installed libmal.i386 0.31-0.1.el4.kde installed libmusicbrainz.i386 2.1.1-0.fdr.0.rhel4 installed libmusicbrainz20.i386 2.0.2-0.1.rhel4.kde installed libtunepimp.i386 0.3.0-0.fdr.0.rhel4 installed mDNSResponder.i386 98-0.2.rhel4 installed openofficeorg-base.i586 1.9.122-1 installed openofficeorg-calc.i586 1.9.122-1 installed openofficeorg-core01.i586 1.9.122-1 installed openofficeorg-core02.i586 1.9.122-1 installed openofficeorg-core03.i586 1.9.122-1 installed openofficeorg-core03u.i586 1.9.122-1 installed openofficeorg-core04.i586 1.9.122-1 installed openofficeorg-core04u.i586 1.9.122-1 installed openofficeorg-core05.i586 1.9.122-1 installed openofficeorg-core05u.i586 1.9.122-1 installed openofficeorg-core06.i586 1.9.122-1 installed openofficeorg-core07.i586 1.9.122-1 installed openofficeorg-core08.i586 1.9.122-1 installed openofficeorg-core09.i586 1.9.122-1 installed openofficeorg-core10.i586 1.9.122-1 installed openofficeorg-draw.i586 1.9.122-1 installed openofficeorg-gnome-integration.i586 1.9.122-1 installed openofficeorg-graphicfilter.i586 1.9.122-1 installed openofficeorg-impress.i586 1.9.122-1 installed openofficeorg-javafilter.i586 1.9.122-1 installed openofficeorg-math.i586 1.9.122-1 installed openofficeorg-pyuno.i586 1.9.122-1 installed openofficeorg-redhat-menus.noarch 1.9.122-1 installed openofficeorg-spellcheck.i586 1.9.122-1 installed openofficeorg-testtool.i586 1.9.122-1 installed openofficeorg-writer.i586 1.9.122-1 installed openofficeorg-xsltfilter.i586 1.9.122-1 installed openslp.i386 1.2.1-0.1.rhel4 installed qt.i386 1:3.3.4-17.0.el4.kde installed qt-devel.i386 1:3.3.4-17.0.el4.kde installed samba-client.i386 3.0.14a-2.1.el4.kde installed samba-common.i386 3.0.14a-2.1.el4.kde installed xscreensaver-base.i386 1:4.21-1.0.rhel4.kde installed xscreensaver-extras.i386 1:4.21-1.0.rhel4.kde installed xscreensaver-gl-extras.i386 1:4.21-1.0.rhel4.kde installed