I’ve published ZipLocator ( http://www.yiiframew…ion/ziplocator/ ): an extension for calculating he distance between two zip codes or to get the zip codes in a radius (currently only works with US zipcodes).
This looks great, I am planning on adding zipcode locating features to the locate behavior of my weather extension. Can you post the source of your data? I had looked at using data from the zips db project
or possibly yahoo placefinder service. Anyway, thanks for the work and I will definitely look at your code.