I have multiple monitors and alt+tab set to show all windows, since I often need to tab to a window on a different monitor.

I often have the the same app open on different monitors, and their thumbnails can be similar. So would be handy if I could tell at a glance which windows are on the current monitor, as a way to tell them apart.

I don't know if it's feasible, but if I could have an alt+tab interface mimicking the monitor layout and grouping the windows by their monitors, would be even better.