The latest version of the XNA Gizmo is now available on Codeplex! You can download it here.
Since my last announcement I have added many features (including all those I mentioned in my previous post) and it should be ready to use in your own editor. I supplied a small framework to show the Gizmo at work. I have tried to make the implementation to your own engine/editor to be as painless as possible, however it can always be easier...(if I knew what all of your engines/editors would look like :) )
I still haven't made a video to showcase all of the new features, but it should be available soon...