http://vector.tutsplus.com/tutorials/designing/create-a-realistic-3d-sphere-logo-from-scratch-using-coreldraw/

In this tutorial you’ll learn how to make a realistic 3d sphere logo. This tutorial is for designers who use CorelDraw as their main software. This kind of logo works well for technology focused companies, as it has a high-tech feel. After working through this tutorial you’ll be able to create similar designs in your work.