Hi!

This weekend I played EXCITE TRUCK (Wii) with a friend.
(btw. a VERY good made fun racing game!)
There is a technique used to simulate a very fast speed of the trucks when the turbo is used:

The objects/terrain/sky on the screen borders look like streched.
Like a fisheye lense on the borders.

I think it's made with a shader.
Can someone help me with such a shader?
I could use it for a pod race game I'm working on.