Dean,

Some of these question would better be directed to the JS API group:
http://groups.google.com/group/google-maps-js-api-v3/

(I cc'd the group into this message)

I'm an absolute newby to this, but have extensive GIS background, so I know
> the principles behind this.  Keep that in mind when you might respond with
> those really technical comments...



Background:

I'm looking to build a site where users can log a path using directions,
> similar to what you'd have in maps.google.com and then also have the
> ability to add waypoints from coordinates.  After that they may be able to
> adjust these routes and then save them to the site.


> Questions:



Is there a way to convert the directions to a polyline they can manipulate
> on the map and add waypoints?


Did you see DirectionsRenderer draggable option? Does this suit?

To get the polyline from directions, did you see
DirectionsRoute.overview_path and DirectionsStep.path?


> Is there a way they can pull in KML files from Google Earth?


 Pull in to do what exactly? KML can be displayed on a map with the KmlLayer
class.

How do I store these data?  Obviously, when I start getting loads of routes
> and waypoints in, the data might get a too much to store on the site
> itself.  I'm planning to use links to other sites for all other data related
> to the routes though.


You could try FusionTables, our preferred spatial data store:
http://tables.googlelabs.com/

For reference to all of the above, check:
http://code.google.com/apis/maps/documentation/javascript/reference.html

Cheers
Chris

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