In order to run 'aticonfig' after emerging the 'ati-drivers [8.27.10-r1]' package, I had to add /opt/ati/bin/ to my PATH variable in order to be able to run 'aticonfig'. I think this is a good to know feature for the newly gentooists. [however this "bug" could also be a consequence of my own ignorance, please advice]
x11-drivers/ati-drivers installs its own /etc/env.d/09ati entry... Run `env-update && source /etc/profile` or logout and login again... <snip> PATH=/opt/ati/bin ROOTPATH=/opt/ati/bin:/opt/ati/sbin MANPATH=/opt/ati/man </snip>