The most concealable for me, is IWB, that's Inside the waist band carry
I carry above my right butt cheek, and behind my right hip bone
since IWB carry puts the weapon on the inside of the pants/belt, it is pressed extremenly close to the body, and is thus harder to see. Also, since it sticks down in my pants instead of over them, if I accidentally lift my shirt up a bit, nobody will be able to see the bottom of the holster.
www.FIST.com also makes very nice holsters.