http://blog.foursquare.com/2012/02/29/foursquare-is-joining-the-openstreetma...
"When we initially began looking around for other map providers, we found some incredibly strong alternatives. And while the new Google Maps API pricing was the reason we initially started looking into other solutions, we ultimately ended up switching because, after all our research and testing, OpenStreetMap and MapBox was simply the best fit for us."
Other companies doing similarly:
http://blog.nestoria.co.uk/why-and-how-weve-switched-away-from-google-ma http://www.fubra.com/blog/2011/11/24/google-maps-free-alternatives/
Looks like the model works.
- d.