Very pleased to learn that the International Development Design Summit
(IDDS) in Boston, running this month, will be using Appropedia for documenting their projects.
This will be a great time to experiment with ways of using wiki pages for documenting designs. My leaning is towards relying on the unstructured format of the wiki, documenting the designs in a fairly flexible way. But added to that, I see us using an infobox to help track certain features of the design, such as the heritage of the design - who has made it, how it has been used by others, and which other designs have been inspired by it.