> Is there a reasonable way to generate a list of all the cities or
> postal codes along a given route between two points?

What form is your route in?

Have a look at some of these for starter ideas
http://groups.google.com/group/google-maps-js-api-v3/search?group=google-maps-js-api-v3&q=along+route
Most of those deal with searching through some set of POI.
Your case is not particularly easy, because you do not have a dataset
to search.
Presumably you'll have to do a lot of reverse geocoding to get nearby
postcodes etc. and that will soon be breaking quotas.
You may have to create your own database of polygons of townships /
postal areas / whatevers, that you can freely search

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