This could be a pop-up that appears in Mill. Or it could make a "ding" sound. Just something that would tell me my report has finished running. It's especially useful for long exports. I don't want to sit there refreshing the queue over and over again, so I begin checking my e-mail or something to pass the time while I wait. This would just be a nice feature. I imagine that larger organizations would appreciate it even more than I would.