If you could figure out production and storage of antimatter, space travel would be very different. I remember reading a Robert L Forward book where he describ

If you could figure out production and storage of antimatter, space travel would be very different. I remember reading a Robert L Forward book where he described all this in great detail. EDIT: I think the book was "Indistinguishable from Magic" which was interesting science-wise but not compelling as a science fiction book. He also seems to have written about antimatter directly: "Mirror Matter: Pioneering Antimatter Physics"