Dear All I need to draw a sky in my little game I had done with terrain .. I had heard about skybox and skyspheres but dont know how to implement them.. can ne one plz giv me some artical links or... some hints. thanks

This is a very basic explanation.
And ofcourse there is always this

Before drawing anything else you draw a sphere (or box) centered on the camera position, with a sky texture on it. You have to disable the depth buffer while doing it, since the sky is further away than anything else you draw. There was a good thread about sky sphere around in the GD forums. Also nice tips are included in a VERY long thread about couds just search in the forum if you whant more details. It is a frequantly asked question...