Mapstraction, the Javascript Mapping Abstraction library that lets you add maps to your website easily, and then switch between various providers has just released a large number of updates.
Looking good

We've also cleaned up the links, the examples, and demos to make it easier to see all the features that Mapstraction has to offer.
More than just 2D

Layers
Sometimes you have additional data you want to include with your map and overlay on a specific area. Mapstraction has added support for GeoReferenced Image Overlay. Now you can easily add data overlays, imagery, or anything to your maps. They then automatically pan and zoom with your map and you don't have to worry about it anymore.
Standards - GeoRSS
Thanks to the broader support of GeoRSS by numerous of the mapping providers, it was straight-forward to add GeoRSS support to Mapstraction. Now you can just load a GeoRSS feed as a list of Markers in any of your maps (yes, even in FreeEarth for GeoRSS-3D).
More than just geometry

The future is bright
We're adding more features to Mapstraction all the time. So let us know if you have specific suggestions. Also, did I mention Mapstraction is Open-source? So you're free to make any modifications you want as well and submit them to us to be added in.