proximity search address geocoding

I am working on a project that will, ideally, include proximity searching by address. So far everything I have found is for proximity searching by postal code, except for the gProximity module that appears to do what I want, but is D5 only. If such a creature exists for D6 I haven't managed to find it. I would also like to be able to number the map markers according to the proximity results so that result 1 is numbered 1 on the map, 2 is numbered 2, etc.

Any suggestions on how to go about this would be greatly appreciated.