I mostly agree with Erel on the IDE design (I pick functionality over aesthetics every day!) but on this one I can't say I'm a fan. I love the functionality, just not the position where it is placed.
I work mostly in VMWare environments (so wherever I work, I work under the same conditions). However, the window bar is often occupied by a lot of other stuff. e.g. in VMWare, moving your mouse to the top of the screen will show the VMWare toolbar, covering the new functionality:
If it where in the toolbar, just below the window bar, I would've been very happy with this as it looks like another huge productivity asset. Implementation now, not that much. (sorry Erel, just my thoughts...)