Has anyone used the web service to code a custom territory based on zip codes?

I have a requirement to take a given zipcode, figure out all zipcodes in a given radius and then generate a map.

Ive written the sql code to return the list of zipcodes and based on linking to the mappoint server stand alone product it comes out fine but now we are trying to learn how to do this with the web service.

Id appreciate any assistance.

Thanks in advance