bigbuba mentions an IDE with support for no overlapping windows:

Just like tab support in the window manager, this might be tough to implement. Anybody take that as a challenge?

It's already been done; I've used it for ages. It's called ion. The development version is very slick -- you can have PWM-style (i.e. normal floating, overlapping windows) workspaces as well as ion's normal no-overlapping windows workspaces at the same time.

In other news, Twisted just keeps on getting better and better... Woven is now one of the best documented parts of Twisted, rather than one of the worst. Also, I started reading and posting to comp.lang.python several months ago so I could point people to Twisted when appropriate -- and mostly, I don't need to. The comp.lang.python regulars are cheerily recommending it already.

And best of all, I got an awesome tshirt while at PyCon featuring artwork from isometric's Twisted-inspired strip. Life's good.