kaffir limes

Anothet thread got me wondering what the difference between kaffir limes and 'ordinary' limes is? And other than the photo that showed one with wrinkly skin and the other with smoother skin, I realised I have no idea! So can someone please tell me?

I have been eyeing a small Kiefer lime tree at work for some time now and recently I just read something about kiefer lime being a key ingredient in Thai curry. That more or less sold me on it, and I've tagged off the tree to bring home next week. I love using the zest of citrus fruits in...