There have been a lot of support requests this week so that has taken away from dev time. A lot of the available dev time was spent making Office 2007 blue and Vista Aero themes. Those are done other than the Aero theme's dock guides now.
We're just starting to get tool windows to be able to be in the MDI area. However that is buggy at the moment.
I'd like to get some more stability in certain features before pushing out the next build. We are going to try and get a new v3.5 maintenance release out shortly so that we can switch to a v4.0 codebase and then start building Docking right in with the other products. This will mean that you'll have the full source of Docking demos and quick starts right in with everything else in the Sample Browser.
We also will have at least one other major new unannounced product as part of v4.0 and maybe even a second. More info on that next week! :)