> Any idea how to make it? Any help is appreciated.

maybe I don't understand the question, but if you want to know the
coordinates of the start and finish of your line, the getVertex()
method for GPolyline should help
http://code.google.com/apis/maps/documentation/javascript/v2/reference.html#GPolyline

if you want the user to be able to construct polylines on your map,
there are various methods. Google gives this example:
http://gmaps-samples.googlecode.com/svn/trunk/poly/mymapstoolbar.html

but I rather prefer mine:
http://www.xelawho.com/map/measure.htm

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