Best way to store overripe bananas?

[lenny_maybe]

 I have three overripe bananas on my kitchen bench. I want to use two of them to make banana cake, but that still leaves me with one left over. I'd like to keep it in the freezer to use at a later date. I would like to know if anyone has suggestions for freezing them. Should I
 - freeze it whole with the skin on?
 - freeze it whole with the skin off?
 - peel it, mash it, and freeze it?

and, how much lemon juice (if any) should I use to stop it from turning completely black? (keeping in mind that it will be used for baking, so colour isn't so much of an issue)

Thanks in advance, domestics :)