Just plain useful - a whole bunch of nice clear 'hamlet' maps which are completely generic and can be popped in wherever you have a need for them.
Individual settlements are presented in a rather blocky and diagrammatic style with every building numbered - all you need to work out is who lives there or what they are used for and write a list (or on the image, as preferred). Surroundings are left quite vague, so you can place them in your own campaign world as required.
Those who are starting a world from scratch might like to look at Troll Hammer Games's Anjora Kingdom Map as a basis instead.
These are functional rather than pretty, but they get the idea across and are very easy to work with.