> I need to have a map where user can draw lines between multiple places
This sounds like polylines, and there is are examples in the google
maps api v3 tutorial

> and save that map.
There are a number of ways to do this - a simple way might be to use a
cookie to save the co-ordinates (look up the w3schools javascript
cookies)

> Later when use opens the same map, he/she should be able to see the
> lines that he has drawn.
Read in from your saved data source, and redraw the polylines

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