I would like to say, that if you do use CentOS, please tailor it to your company if this is for any public use. And add in the IT tech support info. I do recall the article on the idiot who thought it was CentOS's responsibility for his computer problems, when it was his ISP rather. Lets try to leave them out of tech support contacts
Not saying you work with idiots, but there are alot of people who may not remember or have it slip their mind than we may like to admit (hell, it happens to me).