At P2PU, people work together to learn a particular topic by completing tasks, assessing individual and group work, and providing constructive feedback.
This course will become read-only in the near future. Tell us at community.p2pu.org if that is a problem.
Course on WordPress Development
WordPress has been gaining on the CMS marketshare and even won the Overall Best Open Source CMS Award in 2009. It has a great community behind it (and a growing one as well) and there is a lot of interest and enthusiasm on how to leverage WordPress on different scenarios.