Spree 0.2.0 has been released. This release contains several major improvements including the long awaited extension mechanism. The data model contains several improvements but we were not able to make all of the changes we were hoping for. We are still working on a major overhaul of the taxonomy/categorization system but that should be ready in another few weeks. Now that the data model has stabilized significantly we will now be incrementing migrations instead of editing existing ones. Quickstart instructions can be found in the Documentation section. The online demo has also been updated to match this release.