Ian, thanks for taking the time to respond.
I did remove the php-pgsql RPM (rpm -e php-pgsql) as suggested and the yum update now proceeds as expected without error or warning.
Many thanks for the tip and also for the reminder to check DevInfo for secondary Searches, I'd forgotten about that resource.
Aaron.
PS:
FYI, I did try to install the update from the link you provided but it appeared need other items. I dont have a need for the RPM in question so I just removed it.
error: failed dependencies:
php = 4.1.2-7.3.18.legacy.sme1 is needed by php-pgsql-4.1.2-7.3.18.legacy.sme1
postgresql-libs is needed by php-pgsql-4.1.2-7.3.18.legacy.sme1
libpq.so.2 is needed by php-pgsql-4.1.2-7.3.18.legacy.sme1