wxDockIt is getting a lot of work (improvements/bug fixes) at the moment as I'm needing to use it in a real-world MDI application.
I'm also getting help from a number of other people, which is very good!
I am also trying to get an initial GTK+ port going at the moment, but I'm having to learn Linux before I can get anywhere with this!
A new release is on it's way soon.
m.