OpenCL, GPUGPU & Cell
It's hard to shake the missed opportunity Cell represented. While the proof of concept was with PowerPC processors, it could have been applied to x86. Imagine an x86 with 4 or 6 SPUs on the same die. It would scream at doing video decoding, physics etc.
I wonder if Sony / Toshiba / IBM tried to pitch it to VIA or Intel or AMD or let the opportunity be squandered. Whatever the reason, AMD & NVidia have basically turned their graphics cards into proxy versions of the cell. GPUs could already execute code through shaders and the concept has been extended to be more general purpose, hence it's known as GPGPU
It's still possible that Cell could live on and do so in a way compatible with GPGPU efforts - OpenCL. OpenCL is device neutral abstraction layer for compute intensive code and there is already an impl for Cell. So someone could write a physics engine against OpenCL and in theory it could use Cell or AMD or NVidia or CPU to run it on, whichever was installed. I can well imagine that if OpenCL took off that we might see a son-of-cell appearing in some future x86 chipset. It might make most sense in mobile chipsets which don't have the luxury of a powerful graphics card to make use of.