There's a product (the name of which I won't disclose for specific reasons ;-) that has a "cool new UI". On the whole, the cosmetic quality of the UI is quite good. It's attractive to look at, and seems easy to use; it's approachable and relatively predictable.
One of the quirky novelties, though, is that there's an entirely new windowing system for this product's dockable toolbars. This design decision is somewhat understandable: most of the toolbars make more sense being vertically oriented, docked as they likely are to the left or right side of the application's main window. The upshot of this is that the toolbar "caption"—that bar typically at the top—is now found along the side of the thing.
(By the way, my first impression was one of disorientation, seeing the application load for the first time, and seeing "hollow" toolbars load looked like they're rotated 90%)
Despite its new location, it serves its purpose reasonably well on the side. The toolbar title appears there (rotated so it reads sideways) as do assorted buttons to control certain toolbar behaviors. If you drag it, it moves the entire toolbar. All pretty much as you would expect.
That said, it seems like this same windowing system is employed by various dialogs too—larger and more complex than a simple toolbar—and I sometimes find myself wanting to move the dialog aside to see what it's obscuring.
Now for me, moving a window is an act nigh on unconsciously done. Just drag that bar at the top of the window—where it's been since the dawn of GUI—and ... oh, that's right: it's not at the top, it's down the side, remember? Mental Speedbump: move the pointer to the side and continue what you were doing.
Yes, I know. There's no law that says the caption must be at the top. It could be down the side, or along the bottom, or any old place. No argument. And yes, I can (and probably will) just get used to it being where it is. But I wonder why I have to? What problem is it solving for me by being on the side? Yes, it's nice that there's enough real estate to see the whole title—which, by the way, is presented in a particularly large and heavy (bold) font—but that's about it. Other than its cosmetic "coolness" (an affectation I'm not really warming up to,) there doesn't seem to be much else.
Here's another oddity. You'll notice that I've said that the caption is along the side of the toolbar, but I've avoided saying which side. That's because it can be on either side. It seems to favor the left, but is sometimes on the right. Imagine: you drag your toolbar using the left-sided caption to the right edge of the window. Just as it gets close enough to dock with the right edge, the caption flips to the right, leaving your pointer precariously hovering over "live" toolbar. You haven't taken your finger off the mouse button—you're still dragging—but the visual feedback leaves you uncertain. Have you docked? No. Continuing to move the mouse continues to move the toolbar, (albeit by its tail and not by the scruff of the neck... ;) But be careful: if you lift your finger (even accidentally, so get rid of that hair-trigger mouse) the drag is complete and you have to move the pointer to the other side of the dialog to move the toolbar again.
More dangerously, the swap having resulted with a tool button possibly being positioned under your pointer, if the pressure on the mouse button wavers enough, you could end up finishing the drag and immediately clicking that button without meaning to. Ooops! Alt+Backspace to the rescue!
My point in this is that it's good—indeed it's vitally important—to innovate and do new things... as long as it's for the better. It has to improve the state of the art in some material way. If it's just a troublesome bit of gimmickery, I personally would be just as happy sticking with the banal caption at the top of the toolbar.