I'm trying to setup a USB Drive that I can plug in to any of my computers and install CENTOS as well as some 3rd party packages like PGSQL and NGINX (from their yum repo's) but without using a network ...

I'm just getting started with Kickstart (CentOS 6), and I'm creating some new guests on a ESXi host. The ESXi host believes that it's April 20th, and CentOS sets its system time to the same value.