It's a nice, glib quote, but really anyone with common sense would ask why do you want a faster horse. Ask "why" a few times and you get to the root of the problem and then you can think of a solution.

I am always amazed at how many things "regular people" want that I would never have thought of because I don't have insight into their jobs/hobbies/needs. Hang out on a few non-techie forums for a few weeks and you'll probably find tons of ideas.