I have today made available quite a number of worked examples at github. The basic examples are examples taken from the pyprocessing distribution re-worked to work on processing.py. There are examples of very basic sketches, converted from the processing handbook, and others that demonstrate the syntax differences between java and python (eg python for range loops vs processing/java for loops). Other examples demonstrate new processing-2.0 features in processing.py.
Update 29th November, I've published more examples in a more recent posting, these include examples showing how to use the following generative and toxiclibs libraries, this code is also available at github.