Also taking DJB advice - "do not parse" - looks to be more relevant then ever before :) That directory of (mainly) one-line configuration files is really nice to have...

And "config files written in X lang" should seriously and officially be considered as bad-bad thing, worse then XML :)

And languages that have eval or functions re-definitions available at runtime should be considered only in jokes in production environment. And products that use them should be send in outer space direction, just like Voyager ;)

Actually, Turing complete languages are way too much in use. We do not need so much of their powers, especially after deployment.