I LOVE lima beans!  My favorite way to eat them is just with butter and salt.  I buy the frozen baby limas.  I think the reason they get such a bad rep is that everyone overcooks them and they become a mealy mush.
I posted a recipe here a while back, about putting them in a foil packet with fish.  That's a really good meal, but really does nothing to disguise the limas.
I like the tarragon idea..I'll have to try that.