This tutorial shows you the basic elements of skyboxes. It shows you how to create a very simple and basic skybox and specifies information on how to improve this. Future tutorials on this will include 3D skyboxes.

Source: http://forums.qj.net/f-psp-development-forum-11/t-2-new-tutorials-3d-c-skyboxes-and-animated-loading-screens-128419.html

http://www.ghoti.nl/PSPtutorials.php