When we have bananas that are too ripe for eating (too bruised, old, soft and black) I save them. I let them get really ripe (almost fully black) and then stick them in the freezer for future use. I currently have 4 bananas in the freezer and there are 2 on the counter ripening some more just waiting to be put in the freezer. Whenever I am going to use them, I take them out of the freezer early in the day or the night before (to let them thaw) and then I peel 'em up and use 'em how I need 'em. (That was a lot of 'EMs huh)
I use them in pancakes, banana bread and as soon as Parker starts eating real food, I will use them for that, too.
That's what works for me. To get more tips go over to Rocks in my Dryer and check out the list!