wxAUI is an open-source advanced user interface library that aims to make it easy to implement "cutting-edge" interface usability and design features for wxWidgets applications.
I was poking around this morning looking at various bits of Python stuff and I came across wxPython's wrapper around wx.aui. I am a fan of Eclipse RCP
and this looks like an attempt to build something similar via wxWidgets. wxAUI uses the concept of a "perspective" in a manner similar to RCP. There are panels which can easily be dragged and repositioned. I'm going to try using it on one of my smaller apps.
wx.aui is similar to wxDockIt