Has anyone compared this to Leaflet[1] or Mapstraction[2]? Leaflet was a big help on a quick project, but the abstraction was somewhat leaky and there were annoying bugs switching between maps.
While I respect the work done by the Mapstraction guys, I found that to get several non-trivial things working, I had to dig into the proprietary parts of the individual underlying framework - which defeats the purpose of using Mapstraction in the first place.
I had to rewrite large portions of the map interface code when I switched from Google to Open Street Map.
That said, the project is still young and maybe once I get some time, I should really contribute code to it to get those bits I needed working.
[1] http://leaflet.cloudmade.com/ [2] http://mapstraction.com/