The following FASTBUGS have been uploaded to

http://ftp.scientificlinux.org/linux/scientific/5x/i386/updates/fastbugs/
http://ftp.scientificlinux.org/linux/scientific/5x/x86_64/updates/fastbugs/

i386:
kdelibs-3.5.4-29.el5_10.i386.rpm
kdelibs-apidocs-3.5.4-29.el5_10.i386.rpm
kdelibs-devel-3.5.4-29.el5_10.i386.rpm

x86_64:
kdelibs-3.5.4-29.el5_10.i386.rpm
kdelibs-3.5.4-29.el5_10.x86_64.rpm
kdelibs-apidocs-3.5.4-29.el5_10.x86_64.rpm
kdelibs-devel-3.5.4-29.el5_10.i386.rpm
kdelibs-devel-3.5.4-29.el5_10.x86_64.rpm