Ed Brown popularized the "Bobtail" design in the Kobra Carry and the Executive Carry. Dan Wesson (owned by CZ-USA) has a bobtail in their line up in the Commander Classic.
A bobtail rounds off the about the bottom third of the grip. Done for comfort in concealed carry. It keeps the butt of the gun from digging into your kidneys. Some people like it, some don't. I can't say either way as I have not had the opportunity to handle or shoot one in this configuration.