Andreas, try to obtain an 8641D. They may list them, but they are not available.
And Leo is right. The STI partners aren't going to do anything that costs them a profit.
Plus, the design of a Cell based board is VERY complicated. A good example of this is the PDF published by IBM and Mercury engineers on the development of the Cell based PCI-e board.

http://www.sigrity.com/papers/2007/5-WP1GregEdlund.pdf

However, I'd rather not spend all my time working with slow G4 based Soc designs.
Freescale's e700 appears dead, AMCC's Titan isn't on schedule, and IBM still looks like the best bet for up to date designs.
Hey, it can't hurt to ask.
Jim

[ Edited by Jim on 2009/1/31 2:31 ]

[ Edited by Jim on 2009/1/31 2:34 ]