I've committed the Roma Handbook v.2.1 in Open Office and PDF formats. I'm sure that the developers can contribute to it with new examples, corrections and better explanations of core parts and internal mechanisms.
They are availables in trunk\dev\docs folder.
I know, Open Office is not a great tool for sharing documents, but the Google Docs alternative I tried is not really mature to have all the feature we need (yet).
Do you have a better idea?