Hi Yannick,
This year the "Mython, Numba, and more..." sprint focused on making a clear division between the Mython language and the Basil framework. We moved development from Google code to Github, separating our Python pgen implementation into the mythonlang/pgen2 repository, and finished work on a new Mython syntax in the mythonlang/mython repository. We also registered both repositories with Travis-CI, allowing us to verify that pgen2 worked on Python 2.6, 2.7, 3.2, 3.3, and PyPy! We registered both projects in PyPI, including releasing a new source distribution for pgen2.
Despite having a single "full-time" contributor involved in the sprint, we benefited from interaction and support from the other sprinters present.
Sprints are a great way to do open source software development. Sprints provide a group with the opportunity to focus on their project, which may otherwise only be developed in small pockets of free time. Sprints also serve as a forum for both teaching and learning from a community of developers in a more personal manner than online. You can evangelize your project, and learn about other projects that could help you solve your problems.
Thanks,
-Jon