The cell processor is just not available enough for it to be productive, to be honest looking at the price of intel processors there not even viable anymore. At a cost of £1100.00/processor its stupid cost for that performance at that price.

FPGA offer such and amazing attractive package in 45nm and 40nm silicon metal gate providing much faster more density and amazing configurations to a developer and scientific persons. Above all reconfigurable and debuged to any spacific solution allowing outside the box development. The keys to the farrari are in the users hands.
With FPGA configurations data protocols are as fast as 100gbs and can be configured as and when needed, power modes can be configured as needed, processor cores added how ever many you want within constraint of the transistor limit of course. Powerfull SPU’s that the cell processor run on can be designed and programed by the user on an FPGA unlike being stuck with n amount n type.

GPU technology will always be fast its the high amount of funding research development teams not to mention the creative engineers who design these processors. They will always design more and more in this field as they get paid high, very high wages. Yes money fuels this area more than others.

Scalability is a very important part in this field but flexability is far more important, something intel, ibm and others seem to have forgoten about. I must add that sun micropsystems have paid attention to this area well mind you so one of them understand.