Not that I’m that upset considering how poor most people’s driving skills are where I live, but K5 has a neat article up that neatly outlines technologies which really want to be in use today, but aren’t. I know I’ve seen several of these ideas posted in other places before, but the article nicely consolidates them.
Of course, it’s also worth noting that many or all of the ideas in that article come from The Collapsium, a work of fiction, but it seems to me that plenty of cool scifi comes from bleeding-edge technology, itself inspired by works of fiction in an odd cycle.