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I really wish you could alt-tab between windows while dragging and dropping ... this is great when you have little screen real estate and don't want to fiddle with resizing your windows just for a quick DnD operation.
You can just drag the object to the taskbar, and drop it over the taskbar-item corresponding to the target window. The same trick works in Windows btw.
If you drag onto an entry in the task list, that window will come to the top, so you can then drag onto it. Saves having to use the keyboard and mouse at once.
By why should dragging and dropping cause alt+tab not to work in the first place? I would prefer to do it this way, so I don't have to move down to the taskbar, then back towards my destination. I have no trouble using the mouse and keyboard at the same time, having two hands, lol.