Say I want to create a fictional map for use with OpenLayers - what's the best way to go about this?
http://en.wikipedia.org/wiki/List_of_geographic_information_...
Then you can style them, and design a map, using vector drawing software like Inkscape.
Note that his requires writing support (WFS-T or similar) on server side. However, the typical map servers such as GeoServer and Deegree all do support WFS-T.
Nice service, but given that HN is for startups (i.e. commercial entities) these terms make it kind of useless to most of us don't they?
I mean it's based on OpenStreetMap.
Check out the actual site http://www.cloudmade.com/
It's not like these two services are 100% identical. Cloudmade have a bunch of nice tools to style the maps with.