I'm not very interested in doing an official RHEL5 arm port, I'm interested in porting CentOS 5 (whenever it comes out) to the ARM architecture and have ARM be an official CentOS arch.
There's a fair amount of developer chat on irc at irc.freenode.org in #centos-devel.
Please feel free to stop by there for any questions or to meet and greet the other developers and maintainers.