Censoring configuration files

[Ronan KERYELL]

A meta-problem about using tools such as cfengine, FAI, JumpStart,... : many 
people
ask me my configuration files but they contain of course many passwords, PPP
accounts, etc. :-(

So I'm looking for a good way to automate the publication of my config
file AND censoring sensitive information...

Any idea for an elegant way ?

To add some mark-up in config files ? But not always safe for the
application ?

To add an abstract description of each file describing what to overide ?

< Insert your good idea here :-) >

Thank you,
-- 
    Ronan KERYELL              |\/
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