There are many questions that I ask Google that should just show an answer in the results, rather than requiring me to click-thru. A website should be built that addresses this problem. Google’s results show up to 135 characters it appears, so if you can summarize the answer into that, great. You could add a “more…” at the end so the user knows they could click through to get more details on the answer.
Ask users to +1 the answer if quick and helpful to them.
Yes, you won’t get as many page views as other q/a sites, but imagine the time you’ll save people. And I don’t see why Google wouldn’t gobble you up if you did this properly.
I’m going through the past few years of ideas that are in my moleskine notebooks. Some of the ideas are really lacking, but might give you an idea? All of these ideas are yours for the taking. Don’t forget my archive of 100+ web startup ideas.