Free and huge database with city coordinates

I write a web application where the user must be able to search for people which live for instance 50 miles around his city.
So I need a database which contains city names, zip codes and the coordinates for the cities or zip codes. Or maybe there is a free web service which I can call and get the results?
I've seen that there are web services for this. But they need to be payed. I want something free, either a free web service or free data. There is also a free geo data project. But it is limited to Germany and doesn't seem to be well maintained.
The whole thing should work primarily for the German area: Germany, Austria and Switzerland. But it should also work for the world, although it will become important much later.
How do you solve this problem without paying for a professional service or paying for professional data? Or, if you pay, what company has the best to offer in terms of completeness of cities worldwide?

maybe adaptable,
ZIP Code Utility
By Jon Sagara
This article provides an easy method to lookup a U.S. City/State by ZIP Code, or one or more ZIP Codes by City/State. It also describes a method to calculate the distance between two ZIP Codes and find all other ZIP Codes within a radius of X miles of a specified ZIP Code.
http://www.codeproject.com/useritems/ZipCodeUtil.asp

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