Hans,
  That suggestion comes up because, although Public Domain is quite clear in the USA, it doesn't exist as a legal concept in many parts of the world.
By using CC0 the work is clearly licensed, but the conditions match (as closely as possible) the conditions of Public Domain for each jurisdiction to which CC0 is ported.
If you're not planning to fight any court battles, a clear Public Domain grant is just fine for content created in the USA.

On 02/07/2012 10:30 PM, der.hans wrote:
> Am 06. Feb, 2012 schw�tzte Walter Mack so:
> 
> moin moin,
> 
>> please put into a good place on the plug web site. I herewith declare this presentation to in the public domain.
> 
> I have recently been seeing informed claims that we should use CC0 rather
> than public domain, but I hadn't yet looked at CC0.
> 
> http://creativecommons.org/publicdomain/zero/1.0/
> 
> Looks like CC0 is a wrapper around public domain. Interesting.
> 
> ciao,
> 
> der.hans
> 
> 
> 
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