A More Accessible Map

As companies like Google and Yahoo! have simplified the process of placing information on a map by offering web services/APIs, the popularity and abundance of mapping applications on the web has increased dramatically. While these maps have had a positive effect on most users, what does it mean for people with accessibility needs?  
As companies like Google and Yahoo! have simplified the process of placing information on a map by offering web services/APIs, the popularity and abundance of mapping applications on the web has increased dramatically. While these maps have had a positive effect on most users, what does it mean for people with accessibility needs?