Mapping Utility

Hello, I'm looking for someone who can create a Virtual Earth Map or a Google Map that will allow me to zoom to a state, click on the state, have that state show the counties, then if I click on a county I will see the zip codes. Each fo these different layers should be colored/shaded and each of the boundries (county & zip code areas) should be shaded as well. I need this working on my own site & I must be able to input data at the county level. All of this information is readily and freely available on the web (Google Maps & MS LIve Virtual Earth) and US Census data has teh boundry data. So I'm hoping someone already has this compiled or close to it, or someone has experience enough that they can turn this around in a couple of days. Again looking for Google Maps or Virtual Earth, running on our server/domain, with the abiliity to click from state, to county, to zip and show data at the zip level.