Yep, all valid. When I started on it we had to do everything ourselves. But by the time I did serious dev on it our engine team had already build vector/matrix libraries that worked on both ppu and spu and had a dispatcher that took care of all the double buffering for me.
Indeed, anyone who mastered the parallelism of the PS3 bettered themselves and found the knowledge gained applied to the future of all multi core architectures. Our PC builds greatly benefitted from the architecture changes forced on us by the PS3
