cell in order - so what ?

On cell developers will have compiler optimizations like autovectorisation and other ...

http://gcc.gnu.org/projects/tree-ssa/vectorization.html

I think it's easier for me to think cell

as mini cluster

powerpc as master (conductor) and spu's as slaves (orchestra) with crunching jobs submited to them

Vectorial code (simd) aka symphony is arranged by compiler (composer) at another time

Don't forget that memory is closer to cpu (integrated controller) and doesn't need to much of cache and OOo prediction for brached code (low latency)