Small thing I noticed. If you drag a window to the edge, it'll stop when the edge of the window meets the edge of the screen. There's a bit of resistance, and if you keep dragging, it'll then pop over the edge. Small stuff.
Do you have multiple desktops? I currently am running seven, and I don't get that "edge resistance"; when the cursor gets to the edge of the screen, it takes a second then the next desktop appears, but I've had that for quite a few OSs. If you only have one desktop, I'm not sure what behavior to expect.
Really cool! I've found that, like the new response when invoking Mission Control via gesture, that it works dependent on how fast you're dragging. Like if you are dragging really fast, it doesn't hesitate much at the edge (if at all), but if you are moving more slowly and deliberately, IE more likely to be trying for an exact position, it will stop at the edge.
This should be added to the little things thread if it isn't in there.