- Support for Dojo 1.2.3 - Check out the details closely if you are using externally hosted Dojo v1.2.3.
- Layer Extensibility - You can now create custom layer types for both tiled and dynamic services. And, you can also extend the associated based classes to support other layer types such as OGC WMS, and any tiled map service including ArcGIS Server 9.2 cached map services.
- Error Handling – Now every layer and task has an onError event that returns more detail about the error in the callback function. For example now you you can get an error any time a graphics layer is unable to draw a graphic.
- Enhanced Map Layer Management – You can add layers at specific indices in a map, and also remove layers from a map.
As for best practices, don’t forget to test your code after changing your script to point to the v1.3 URL.