I just did a clean minimal net install of Cent OS 6. I did a netstat just to see what was listening:
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1165/master tcp 0 0 0.0.0.0:5672 0.0.0.0:* LISTEN 1178/qpidd
Besides ssh, I also see qpidd and what looks to be mail on localhost. I tried to google around to see what these were and why they were running by default on the minimal install. If possible I want to disable these as I am trying to go very very minimal with this.