Geo::Google::StaticMaps, which basically just transforms a map definition given as a bunch of nested hashes and arrays into a Static Maps API URL. It ought to support everything that the Static Maps API itself currently supports.
Anyone who lives in even a smaller city knows the importance of neighborhoods. Portland (where I live), for example, is really more like a collection of many connected small towns. Each has its own handful of coffee shops and restaurants. The people behind GeoReach API (our GeoReach API profile) understand this. The API provides neighborhood boundaries, along with local content.
RentRent.org has announced the creation of an API that searches local Craigslist entries for rental properties including apartments and houses. This gives developers the ability to integrate rental searches with mapping applications and APIs (our RentRent API profile has details). [Note that RentRent.org is not associated with Craigslist.org.]