The examples use a module called "run" to run the example. There is also a "run" module in the IDLE tool, which confuses Python when using IDLE.
I'm not sure that this actually causes any problems, but just to safe, I've renamed all of the run.py files to driver.py in the examples.
Fixed in revision 6de8ee4e7d2d. Will be included in Pyke release 1.1.1.