Digital Inspiration’s Find Postal Address … site is a one-trick pony, but does it well. Zoom to a location in Google Maps, click on the map, and a pop-up will give you the closest postal address to the point you’re clicking on:

A search box aids in zooming in quickly to a desired city or zip code.
Related posts:
- Another Google Maps Geocoder/Reverse Geocoder
- Reverse Address Geocoding With Google Maps
- Worldwide Reverse Geocoding With Google Maps
- Get A Postal Address By Clicking In Google Maps
- Mapping Zip And Area Code Boundaries, And More
- US Address Geocoding For Google Earth
- Online Traveling Salesman Problem Solver
- Multiple Coordinate Systems In Google Maps, Reverse Geocoding, And More With The Worldwide Coordinate Converter
- 3D Anaglyph Views In Google Earth
- Online Geocoding, Address Verification And Shortest Path Utilities From the USC GIS Research Laboratory

Interesting note: This site in enslaved to Google Maps. I clicked on my house and received the correct street address, but the wrong town. This same mistake is made in Street View (I reported it almost a month ago).