Just want to chime in that I'm glad people are still interested in CommonJS Modules/2.0. We have a working implementation that hopefully will be of interest, and have factored out the generally applicable parts of our test suite. Also see the announcement thread on the CommonJS list.
That said, personally I've been a bit disappointed with the CommonJS community's lack of enthusiasm on Modules/2.0. We picked it up early in our project lifecycle, and ran with it full speed. At the time it seemed like a more standardized alternative to AMD.
However, over time it's become clear that AMD has not only won mindshare but also has a much more active group of maintainers and a better, more egalitarian standards process. Whereas, Modules/2.0 has only the perennially busy Wes Garland, leaving a self-hosted PDF s