Well, the Cell processor, to my thoughts is a great way to intergrate your product to the multimedia area! YOu can apply the processor to TV, PC, Systems, Sound based and more! But the price will kill the product.
If you look at the PPC Dual Core MS is using is a good basic and cheap and easy for the devoper community and for the use for the system as well as a good product, but it can't be applied everywhere.
The way I see it as the Cell is like Windows, a hope to put your product everywhere and to hope everyone can use it.