> Given path (polyline?) taken from Google Maps directions and a point,
> what is the best way to tell if that point is along the path?

One approach would be "how far is the point from a polyline" and see
if it is close enough by your definition.
Discussion
http://groups.google.com/group/google-maps-api/browse_thread/thread/f887ee95b6a57682/41496f310c68a477

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