For predictions further out, I'm betting that in five years, some of the big things will be optical interconnects, networks-on-chip, mainstream GPGPU, 3D chips, and solid state drives. SSDs are already a safe bet; the rest is more speculative.

I'd put these on PB (and give optical interconnects a low prediction since it feels like I've been reading about them forever), if you could operationalize them/make objective & judgeable.