heheh - if this is still an issue in October, I can only imagine the angry horde in front of their booth. http://www.cpanel.net/2009/06/centos-is-exhibiting-at-cpanel-conference-2009.html
Man - if I had *any* pull within RH, I'd be screaming that we need to release some sort of a cross-grade app to pull in the CentOS users NOW. Give them a few months of free support for their trouble.
Texas is a right-to-work state. As long as you did not sign a non-compete or there was no restrictive clause in your employment agreement, you should be ok. Sounds likt the guys are just pissed.