You need the 1.12 release to work with with PostgreSQL 9.0. Whether or not it is available on a CentOS package is another question, but I don't have an answer for this one.
you mean, like this? http://yum.pgrpms.org/9.0/redhat/rhel-5-i386/pgadmin3_90-1.12.1-1.rhel5.i386.rpm
if you installed the yum.repos file appropriate for your version and architecture, simply run...
# yum install pgadmin3_90 and get the latest. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general