Anyone tried these:-
http://www.drylinepro.com/
http://www.youtube.com/watch?v=u3wNi7H2tDs
I also remember a couple of years ago I recieved a sample of a two part fixing made of metal where you drilled a 1/2 inch hole in the plasterboard and fitted a collar into that. This collar then had an inner barrel which screwed into it so that it was in contact with the wall behind. A normal plug and screw then went through the middle of the whole lot and when tightened the metal parts would transfer the load back to the wall.
I saw a post about them either on here or over on TT, but can't find it now.[/url]