Google implemented a number of changes to its Maps API Standard Plan. Apps created on or after June 22nd will be subject to a host of new rules surrounding access and limits. Active domains utilizing the APIs prior to June 22nd are grandfathered in to differing degrees depending on implementation.
Wikimapia is a web service that allows users to edit information on a world map in a wiki format. Users of the site can add places, edit them, and get the information previous users have entered. The info there is currently pretty sparse, but the service is rather new. The company also recently released a Wikimapia API that supports getting information from the web service.