Right now my favorite is the CQC/S (Close Quarter Covert w/ Snap) by the late Lou Alessi. Lou's daughter Alexandra is continuing the business at Alessi Gun Holsters .

The CQC/S is an outside-the-waistband holster with a oneway snap on either end rather than fixed belt loops. The loops make it easy to put on or remove without unfastening the belt. The leather's molded tightly enough that no retention strap is needed, and it carries equally well concealed or openly when hunting or woods roaming.