Urban design and changes to post office delivery methods
The latest proposal for "reforming" the US Postal Service and reducing costs includes ending door-to-door delivery of mail, by creating "cluster mailboxes."
-- Our Plan - Saving the Postal Service, House of Representatives Committee on Oversight and Government Reform
-- "Door-to-Door Mail Delivery on Chopping Block," CBS News
However, while the figure of 80 cents per day per household was bandied about as the cost of providing mail delivery, I imagine that is an average, that it is cheaper to provide door-to-door service in dense neighborhoods and more expensive in less dense neighborhoods.
Although not according to the CBS News article, which says that the cost of delivery to city households is $353/year, almost $75 more than the cost to suburban/rural households.
But doing suburban-style cluster mailboxes in the city would be a disaster.
I also think that modifying a British style phone booth could work.
In any case, addressing this issue now is paramount, or at least figuring out what these proposals mean to cities.
2. Also, as a revenue generating measure, it would be possible to add some large boxes to these urban-appropriate cluster boxes for use by package services like FedEx and UPS (the general problem was discussed here, "City transportation departments need to set up innovation units") on a fee basis. The use fee could go to USPS.
3. Concerning the separate issue of closing post offices, the National Trust for Historic Preservation has a blog entry with 10 steps for advocacy campaigns focused on saving local offices.
-- "10 Ways to Fight for Your Local Post Office," PreservationNation Blog