Oh Yeah - that's the thread I remembered, too. Glad you brought it back up, now I remember Bit bits recipe.
I made banana bread last night with a larger-than-normal-dose of bananas and three paks of the Stevia (I have a lot, I might as well use it up *sigh*). Either the equivalency that I found on line wasn't quite right or my particular brand uses some kind of filler; it definitely needed more, for typical banana bread.
It was suggested on the site I saw that the aftertaste was usually a factor of using too much - evidently it's somewhat stronger than your usual sweetener or sugar.