Found this great post off Slashdot.
Down in the article they talk about a new Petaflop supercomputer that IBM is building..
Read this quote and ask "Does this architecture sound familiar?"
"Roadrunner is the first rendering of a hybrid computing architecture: multiple heterogeneous cores with a multitier memory hierarchy. It's also built entirely out of commodity parts: AMD Opteron-based servers, Cell BE-based accelerators and Infiniband interconnect. Standard processing (e.g., file system I/O) will be handled by Opteron processors, while more mathematically and CPU-intensive elements will be directed to the Cell BE processors."
Did you catch the pool of cell processors directed by a master (and separate standard) processor?
I guess that makes the PS3 a "proof of concept" super-computer.