Weblets are petite collections
of format files and databases to get you started building your
Weblet ZipCodes is a finished,
working zip code proximity searching application. You won't believe
how simple it is to modify or work with. It's powerful and complete
enough to use just as it is, and it's flexible and easy enough
to work with to integrate it into your existing web site. Useful
for finding the nearest locations to a customer, for example.
If you want this function just in FileMaker (without the web
stuff), look at ZipCodes FM.