Both are made of metal and have a silver look -- the PowerBook is made of titanium and the Edge is made of anodized aluminum.  Both have a lighter plastic color along the sides, and both are very thin.  I imagine that the Visor Edge will be a big hit with PowerBook owners.

The Visor Edge is a great status symbol with its sleek look and rugged design.  I love the fact that I can carry it in my back pocket wherever I go.  One could even make the argument that a replacement case is unnecessary.  The metal stylus, while much better than the "toothpick" that came with early Visors, takes a lot of getting used to.  If there is one thing that I would improve on the Edge it would be the stylus.