I'm surprised that nobody hasn't thought of this:
A site that not only tells you where stuff is, but also tells you how
far other things are from that place.
Say you're wanting to change your oil, and while you're waiting you want
to catch a movie. I might drive another, say, 5 miles out of my way to
make that happen, or even way further if I could take care of a bunch of
other errands at the same time and eat some kickass Mexican food.
What do you guys think? With all of the open APIs out there, I'd
imagine that the individual pieces are there, all someone has to do now
is snap them together.