For slow helicopters, the addition of wings does not appear to be advantageous. The money and weight etc. would be better spent by increasing the existing engine, power train and rotor. Initially, Schramm's new recreational Helicycle offered the option of adding a pair of wings and a pair of pusher props plus engines, at the wing tips.
For high-speed helicopters, the wings must be complimented by an additional device that produces forward thrust. This is moving into the domain of VTOL aircraft.
VTOL aircraft have a number of problems that may be eventually worked out, but to me, they have one problem that none of the current ideas have solved. This is the burden of carrying the 'deadweight' of forward flight components during vertical flight and then the burden of carrying the 'deadweight' of hover flight components during forward flight.
This brings up, from the depths of the Department of Demented Designs, a crazy idea for short and regular routes. Leave the vertical flight components on the ground and only take the horizontal flight components aloft. Perhaps something like the catapult and arrestor cables on an aircraft carrier.
So much for dumb ideas. I will now join Lu, by bending over. <img src="redface.gif" border="0">