That's actually a pretty cool idea!
The way I would approach this would be to setup an alert on your interface utilization; then use the alert action to email a webpage. Just point that webpage to a report that you build that shows the other interfaces with >50Mbps traffic.
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Thanks for your input - that seems like a good way of doing it.
I had a bit of trouble getting the 'Email a Webpage' alert working but using a standard email alert and putting the report URL into the body of the email seems to do the trick.