There are two major improvements from 0.2, and they are:
Asynchronous SADI Support
We can now write asynchronous SADI services in Python. With this change, Python SADI is now a full implementation of the SADI framework. Implementation is still very simple, but allows for varying levels of control, including the ability to have the service wait for third-party results (including from real people). See https://code.google.com/p/sadi/wiki/BuildingServicesInPython#Writing_Asynchronous_SADI_Services for details on how to write an asynchronous SADI service.