I think everyone can name bad or premature ref stoppages - e.g. the Landless stoppage of Baroni vs. Tanner - but when you think of a smart ref stoppage that really saved a fighter an unnecessary beating - even if the fighter later protested - which fights come to mind?
A couple for me are...
Sylvia vs. Mir
Ortiz vs. Tanner
Any others? Personally I think good ref stoppages don't get the credit they deserve.