Look at http://www.mapstraction.com http://www.mapstraction.com ... It provides a common interface to many map providers, one of which is completely open (open

Look at http://www.mapstraction.com http://www.mapstraction.com ... It provides a common interface to many map providers, one of which is completely open (open layers). More importantly, you don't need to change your code if you decide to switch providers (or in our case, allow our customers to choose). I hope this helps!