Little late to the question, but I did a Lime Cream Ale recently, Kurt Stock's recipe in the Homebrew All-Stars book. I did the zest of 4 limes, soaked in vodka for 2 days, then added that to fermenter two days before kegging. Then on kegging day, I added the juice of those 4 limes to the keg. It was definitely very limey...but was very good, a nice refreshing summer beer. My friends were busting my chops about making it, but they all loved it.