When a sledgehammer or annihilator won't do, turn to a concrete-eating robot instead. The Stanley LaBounty F16 can rip through walls, snip rebar, and pulverize concrete about as fast as a six-person wrecking crew armed with handheld tools.
This robot is really better at smashing up huge surfaces, like malls--its drop hammer can demolish 1,000 square feet of concrete
floor an hour--but your DIYer could always use it to take apart a driveway really, really fast. $135,000, or about $4,000/week rental, Stanley Hydraulic Tools