Google is amazing. But there’s one serious concern (not problem, but concern in the sense of “something we need to consider”). Google Book Search will become a stunning addition to the armamentarium, but is full of first drafts of scanned books: full of errors and missing pages.
Google Maps is a wonderful resource too. But look where I ended up staying the night:

Look at the Renaissance where I’m staying (blue “X”) and the adjacent dark gray building to the west. Give you a headache?
I know what happened, of course: two aerial (satellite?) photographs taken from different points on different days were stitched together, and quite rightly so: we have a fine-scale map now covering vast tracts of Seattle.
But here’s the kicker: Will this ever get “fixed”, or will we undergo a cultural adaptation—a blindness, as it were—to the physical impossibility of this sort of image? Will we all go through Google Book Search and replace those missing and damaged digitized pages, or will we adapt to their lack by simply calling it good enough?
Is this how maps will look in the future? Escheresque?