Good find!

Look up the PowerEN and that might have some clues. Probably special blocks for crypto, network etc.

Another thing that IBM actually said in the past is Cell will merge into things like POWER. So don't be surprised if SPEs turn up at some point.

What I thought interesting was the mention of a very large cache, as if 32MB wasn't big enough already!

That said the IBM mainframes can have 196MB cache...