Ivory bars (I'm chemically sensitive, no Irish Spring near me please).
I also like small bars and I hate those huge bars that I can't close my fingers aroud and keep dropping while showering. You drop a soap bar on your toes and it friggin hurts! :|
BTW, real trivia here: In France, a couple of years ago, a poll pointed to the average yearly use of soap as 2 1/2 bars per person. The French host of that television program (Vivement Dimanche if I remember well), Michel Drucker, was flabbergasted and started lecturing to the people on air. He ended up saying: "Lavez-vous, merde!"

That was hilarious. I love TV5.
Lavez, Lavez (Martine St-Clair)