Conform selected edges or vertices to the objects surface Hi all,

I would like to scale the selected vertices inwards and make them to stick on to the surface of the cylinder that i have placed in the centre. the cylinder is not joined to the plane.Would be awsome if some one would help.Thanks
As the object you want edge loop to stick to is circular (cylinder) then the edge loop should become circular. This can be easily done either via default command Shift+Alt+S, then setting the factor to 1 or via LoopTools addon, Circle option. See also How do I make vertices equidistant from a given center?  

Note to avoid making faces too distorted, in this case outer edge loop shown on screenshot is better to be moved towards cylinder a bit or add one more edge loop in between existing ones.