Cool to see interest in geographic membership mapping. Ultimately, I think, this would best be accomplished with data driven (database using longitude and latitude fields) SVG in ASP.
SVG is an emerging W3C Recommendation/standard ideal for data driven Vector-based Web Cartography & maps, as well as, other graphic and animated graphic projects. SVG can be imbedded in Snitz and other ASP apps. To begin tinkering in SVG download Amaya a free open source W3C-project browser and SVG editor.
tCharles - How much of an interest is there in street level mapping for a product like Snitz?
ChuckMcB - If we can find a suitable PD map(s) that you want to use, I am willing to make the image map for you...
LeoRat - I brought up the idea and I am helping to try to develop it. That question will depend on who creates it as a MOD. If ChuckMcB has the code and just needs maps, he will be the one to ask.