The most recent XO program for PyDebug is available at OLPC DOWNLOAD PYDEBUG. I have tested this code on builds 650, 802, and 852 (XO1.0 and XO1.5). I would welcome feedback about results on other systems.
Source code for the project is hosted at Sugarlabs
Please report bugs, with as much information as possible about hardware, and software build number to the SugarLabs bug tracking system
Here is a link to the PyDebug bugs on the SugarLabs system