Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.
I was searching for a my nearest Royal Mail collection box. The first thing I (rather We) techie people(or consider as techies) will do is to do a google to find out if there is any maps or mashups from Royal mail to see the post boxes. Or is there any letter drop box locator, where you give your post code and get the nearest box, easy isnt it :).
Unfortunately (or fortunately) till today, the only way you can find the nearest letter collection box is the ancient way for going through each street and find out a letter box, and see which one is near.
Well being a techie to find out which one is near, I have used local.live.co.uk to measure the distance between the box and my home:). and the nearest one for me is .3 miles away.