Blah Blah Blah. Playstation 3 with suitable Linux is great and cheap LinuxBox - great OS. All but firts PPEs can be used in similar fashion as multicore x64 by OS as well as I believe they can be programmed independently, all but first that is locked to Sony OS. Its great hardware, and it can be used exactly as DSP in Falcon used to - PPE can simulate or process anything so it is a great and usable design with some software that would use it.
But PPE support might come in OS 5.0 :-)
For nearly all scenarios of use, a cheap Intel or AMD box would destroy a PS3 under Linux. The Cell's single PPC core can't even do out-of-order execution. In the scenarios where they would not, the SPU's would be put to use with specific Cell code -- something you do not find as part of the Linux OS. Sure there are a few apps that do it, but they are rare.
bp