Hi Harald,
Is there some other "as free as public domain" license? I don't like to reinvent the wheel, but I haven't found one yet.\
I ususally recommend and use the MIT-Licence for that, it essentially says the same stuff as yours, is the shortest of all on opensource.org, and is well known and widely used.
(Like you, I was looking for a shortest licence once, and after consulting d-legal, I stuck to the MIT-Licence.)
Link: http://opensource.org/licenses/mit-license.php Gruesse, nomeata