The S/360 introduced many innovations like VM... the 360/67 was an amazing piece of work, probably around the same time as the Multics project (another work of genius!).
I've always been fascinated by S/360 and S/370 model evolution. With S/360 IBM bet the company! First real "family" of computers... Seymour Cray was still at CDC at the time... didn't split until the early 70's after CDC dropped his supercomputer project (and he went on to the 1976 Cray-1).
Cray's biography is also fascinating.