I've tried to talk with people at Google for 2+ years about
that...showing them live before-and-after comparisons that could shave
25-30% off their image tile sizes without changing their appearance
on-screen whatsoever. About as far as I ever got with them, besides a
condescending pat on the head and a few "that's nice" comments, was
talking with one of the lead persons on the StreetView project.
For a company that touts its "green" solutions though, Google sure does
waste terabytes of bandwidth in its Maps product for no good reason.
Sorry for the rant.
Derek