The chocolate ones are never a let down and stay super moist and chocolatey (I did add extra melted chocolate and some cocoa) and I made chocolate buttercream icing rather than the chocolate glaze as suggested on Cassie's site.
As for the key lime, we had mass amounts of limes for beer. The icing is a lime cream cheese almost glaze rather than icing in consistancy and I topped it with some candied lime zest. I was told that they were quite possibly the best cupcakes someone's ever had. There was one woman who came in to buy some of the lemon drop cupcakes I made earlier in the week because she thought they were amazing but we were out, so she bought a bunch of these ones instead and seemed quite happy about it.